|
HS Code |
865564 |
| Product Name | Catechol Violet |
| Cas Number | 115-41-3 |
| Molecular Formula | C19H14O7S |
| Molecular Weight | 386.37 g/mol |
| Appearance | Dark green to black solid |
| Solubility | Soluble in water and ethanol |
| Melting Point | 225-230 °C (decomposition) |
| Absorption Maximum | Approx. 420 nm (aqueous solution) |
| Purity | Typically ≥98% |
| Synonyms | 4-(2,3-dihydroxyphenylazo)-3-hydroxy-2,7-naphthalenedisulfonic acid monosodium salt |
| Ph Indicator Range | 0.0–1.4 |
| Storage Conditions | Store at room temperature, protected from light |
As an accredited Catechol Violet factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Catechol Violet is packaged in a 25g amber glass bottle with a tightly sealed cap, labeled with hazard and handling information. |
| Shipping | Catechol Violet is typically shipped as a solid powder in tightly sealed containers to prevent moisture and contamination. It should be packaged according to chemical safety regulations, with appropriate hazard labeling. Shipping may require documentation (SDS), and transport must comply with local and international guidelines for laboratory and hazardous chemicals. |
| Storage | Catechol Violet should be stored in a tightly closed, light-resistant container at room temperature, ideally between 15°C and 25°C. It must be kept in a dry, well-ventilated area, away from sources of heat, moisture, and incompatible substances such as strong oxidizing agents. Ensure proper labeling, and avoid prolonged exposure to air to prevent degradation of the chemical. |
Competitive Catechol Violet prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615380400285 or mail to sales2@liwei-chem.com.
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Tel: +8615380400285
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As a chemical manufacturer with decades of colorimetric chemistry experience, we recognize how small differences in formulation produce big differences in performance. Catechol Violet, sometimes called Acid Violet 4B, stands apart for its stability under variable laboratory conditions and its crisp color change at critical points. Our direct control over synthesis ensures batch-to-batch consistency, which many downstream users find essential in analytical applications. Scientists, students, and QC teams return to Catechol Violet because it helps reduce sample misreads without the need for complex protocols.
Producing Catechol Violet means more than just finishing an order. Strict starting material screening, tight reaction conditions, and attentive purification give us a product with a defined melting point and a purity that stands up to the closest inspection—typically above 98%. Grain size influences speed of dissolution, so we offer not only fine powder for rapid mixing but also slightly granular forms for slower-release solutions, according to user feedback from the field. Each package comes vacuum-sealed to hold back moisture and prevent contamination from interfering with future tests.
Labs rely on Catechol Violet as a complexometric indicator—not because it’s the default, but because of the sharp, unmistakable color split it delivers near pH 3.2-4.4. In practical terms, that range matches common analyses of heavy metals like calcium or magnesium. Some labs have previously wrestled with dithizone or Murexide when running these titrations, but found their colors less distinct under mixed lighting or in colored samples. Catechol Violet addresses this gap and helps chemists avoid ambiguous endpoints, especially when running water hardness analysis by EDTA titration. Over time, users report fewer failed runs and less need for repeated analysis, which translates to real savings in resources and time.
Our factory’s experience extends beyond just providing high-purity chemical. We gather user feedback, reviewing how Catechol Violet performs outside idealized lab settings. For example, in field water testing, cloudiness, variable temperatures, and unexpected sample constituents often distort indicator response. Catechol Violet’s resistance to these confounders keeps readings cleaner and reduces technician error. We routinely see field kits relying on pre-dosed paper strips treated with Catechol Violet because alternative indicators can’t maintain clarity after long storage or rough transport. Enough chemists now regard Catechol Violet as the best balance of sensitivity and selectivity in this essential range.
Training new analysts and students highlights the importance of reliable color indicators. In our outreach with technical colleges, instructors point out how Catechol Violet builds confidence: students can see the exact moment the hue flips, which teaches them the fundamentals of titration endpoints with less ambiguity than broader-spectrum dyes. Industrial users handling routine quality checks in water processing and food industry settings send similar feedback. They prefer Catechol Violet for fewer false positives and negatives, tighter correlation to certified reference standards, and reduced risk that small formulation changes might skew results across production batches. In the end, it becomes clear to those on the bench that not all indicators deliver the same assurance.
It’s easy to list specs: melting point, solubility, spectral absorption maxima at 575 nm, and so on. For most users, these numbers gain meaning only in the context of what they enable. Catechol Violet distinguishes itself during repeated handling and dissolution, with minimal residue forming in solution even after several reconstitutions. Our in-house monitoring reveals this stability as a direct result of strict raw material sourcing and multi-stage filtration. Impurities that might otherwise degrade the hue or limit shelf life get removed early, extending product usability even when stored in less-than-ideal stockroom environments.
Users most often dissolve Catechol Violet directly into water or buffered salt solutions prior to titration or complexometric assays. For high-throughput testing, automated liquid handling systems benefit from the dye’s rapid dissolution and low particulate background. In contrast, traditional indicators can introduce cloudiness that throws off optical readers and clogs tubing. Chemists working with mixtures containing iron or other transition metals appreciate Catechol Violet for its defined chelation behavior and the absence of spurious background colors. In our field support, we see far fewer complaints of “drifting” endpoint hues with Catechol Violet than with generic indicators, especially under repeated cycling between acidic and neutral pH washes.
Preparing working solutions from our Catechol Violet doesn’t take advanced skills: simply weigh, dissolve, and buffer as protocol requires. Because the powder disperses quickly and doesn’t clump even under humid conditions, users avoid wasted time breaking up aggregates. Each bottle includes a desiccant pack, preserving flow and making for more consistent solution strengths from the top of the jar to the bottom. Titration curves remain tight and repeatable, thanks to a combination of purity and optimal grain morphology that minimizes over-shoot or lag at color transitions.
Over the years, many technicians start with indicators like Eriochrome Black T or Bromocresol Green—drawn by low cost or broad utility. These standards work for general applications, but users often encounter blurry endpoints or inconsistent color changes in difficult samples. Catechol Violet, by contrast, persists as the indicator of choice where clarity, narrow transition, and insensitivity to interfering ions truly matter. In wastewater research funded by regional governments, for instance, our Catechol Violet supports better heavy metal tracking without the need for secondary confirming analysis. This reliability matters where budgets and safety both run tight, and where ambiguous data can mean lost time or even failed compliance checks.
Repeat customers shape much of our understanding about what works day in and day out. Many production managers report that Catechol Violet’s reliable supply chain and stable formulation have reduced downtime tied to ingredient backorders or quality complaints. In multi-shift operations, where analysts rotate frequently, they trust the consistency of our product to avoid troubleshooting mysterious new behaviors every time a new batch arrives. Even those with strict audit requirements find full documentation and batch traceability—a reflection of our manufacturing philosophy where transparency and control mean more than marketing statements.
From the start, our manufacturing line has committed to responsible handling and cleaning. Catechol Violet’s popularity in teaching labs and municipalities means it often ends up handled by less-experienced users. That means low dusting and careful fugitive emission controls matter as much as final purity. Our process emphasizes minimal release at fill and packaging stages and avoids contaminant cross-exposure with other dyes or solvents. Many downstream health, safety, and environment officers have cited our well-documented training as a reason to recommend our product in regulated installations.
We have always welcomed open dialogue with lab techs and chemists using Catechol Violet in unexpected or challenging conditions. Feedback from marine research teams working under variable salinity levels uncovered the need for small adjustments to crystal size, improving both dissolving time and visual contrast in complex backgrounds. Feedback taken seriously results in real progress, not just incremental tweaks but fundamental improvements to formulation or packaging. We field-test new runs with early adopters before rolling out changes factory-wide, and only secure broad release upon directly verified, real-world benefits.
Catechol Violet’s reach crosses multiple frontiers—water testing, biochemical research, metallurgical analysis, and even teaching demonstrations. Our product’s predictable reactivity unlocks subtle analytical techniques that starker indicators struggle to match. For example, trace nickel detection by photometric analysis depends on minimal baseline drift and strong absorbance at specific wavelengths—attributes Catechol Violet reliably provides. Researchers working outside academia, including government inspection agencies and food quality labs, rely on our material to support consistent, reportable data without the headaches of batch-to-batch guesswork. From the beginning, our goal stays the same: supply an indicator that performs not just in controlled conditions, but under the press of real deadlines and unpredictable challenges.
Chemicals don’t get made in a vacuum—the byproducts, energy demand, and waste handling of every batch must be managed responsibly. Over time we have changed solvent recovery methods, shortened purification cycles, and reduced packaging materials to lower Catechol Violet’s overall environmental impact. With stricter global regulations and growing demand for greener chemistry, our efforts now focus on full lifecycle evaluation. Where past standards permitted wider tolerances for residual solvents or process waste, our factory’s environmental team commits to exceeding these baselines for safer handling and easier recycling. This work matters for users who count on high-purity indicators and for our staff who keep the plant running, day and night.
Automated systems handle much of modern manufacturing, but experienced technicians still make a tangible difference. Our QA staff inspect each production run not only by instrument—titrating against NIST standards and running HPLC scans—but also by careful, repeat manual titration checks. They recognize off-kilter hue shifts before machines do, and they spot minor formulation changes—a reflection of our longstanding investment in hands-on training. These checks root out inconsistencies that might otherwise go unflagged before the bottles reach the shelf. It’s the human side of quality control that keeps our Catechol Violet at the level professional users have come to expect.
Market requirements shift as industry adapts to new regulations, research trends, and cost constraints. Our factory tracks these developments, sourcing feedback from buyers and distribution partners. Some regions now demand non-toxic processing aids in food and beverage assurance labs; others ask for more compact, recyclable packaging. Our adjustments to Catechol Violet’s presentation and documentation reflect these market realities. Whether responding to a spike in remote water monitoring or evolving regulatory standards for teacher safety, our commitment to improving the product and its supply chain remains steady. Anticipating future needs, we invest in cleaner technologies and digital traceability so customers see transparency from source to shelf.
We heard from municipal labs that glass packaging left too much residue and risked breakage, especially in rapid deployment. So we transitioned to durable, chemically stable plastics with tamper evidence. Factory tests mimic real shipping and field use to minimize clumping and protect powder purity right down to the last use. Bulk users, including high-throughput plants, appreciate the easy dispensing and tightly resealing lids, which cut down on cross-contamination. Each handling innovation stems from direct operator and user experience, not just marketing surveys.
Direct comparisons highlight why Catechol Violet holds its ground. Some customers start with Eriochrome Black T or Calmagite when cost drives the initial decision. But those facing regulatory testing or operating at analytical detection limits nearly always switch to Catechol Violet after experiencing sharper, more reliable color transitions. In titrations where multiple metals might be present at trace levels, Catechol Violet’s selective chelation pattern avoids the signal-dulling “muddy” phases common with broader reagents. Our relationships with university researchers confirm that student error rates and analysis times drop measurably when they standardize on our product—evidence of the real value in consistent, factory-direct sourcing.
Improvement never ends, and we see every user’s challenge as another cue for betterment. Our product development team reviews new synthesis technologies and collaborates with supply chain partners on stabilized forms or greener synthesis pathways. Ongoing investment in employee training, risk management, and analytical instrumentation pays dividends not only in product quality but also in problem-solving. We support open lines with every buyer, whether end user, teaching institution, or industrial lab, and encourage a feedback culture that values candor as much as compliance.
From municipal compliance testing to daily water hardness checks in beverage manufacture or classroom teaching, Catechol Violet’s precision turns trial-and-error into predictable results. It’s not just about the numbers—it’s about confidence. Batching, handling, and storage practices evolve because our people listen, analyze, and adapt with each delivery. Those who stake their operations on repeatable chemical responses trust us because we operate from real-world perspective, rooted in decades of practical, hands-on manufacturing experience.
Factories carry stories—of improvement, learning, and continuous refinement. Our Catechol Violet isn’t a generic chemical pulled off a mass distributor’s shelf; it’s the outcome of thousands of direct tests, end-user reports, and steady quality oversight. Clarity, selectivity, stability, and safety form the core values we built into every bottle. The chemical industry tends to focus on scale; we focus on service and responsive improvements. As methods grow more exacting and downstream needs shift, we stand ready to supply indicators purpose-built for accuracy—because every lab, analyst, and teacher deserves the certainty of results delivered right the first time.
