|
HS Code |
280926 |
| Name | O-Cresol Red |
| Cas Number | 62625-29-0 |
| Molecular Formula | C21H18O5S |
| Molar Mass | 382.43 g/mol |
| Appearance | Red to brown powder |
| Solubility In Water | Slightly soluble |
| Melting Point | 245-250°C (decomposes) |
| Pka1 | 1.2 |
| Pka2 | 8.0 |
| Lambda Max | 430 nm (acid form), 573 nm (base form) |
As an accredited O-Cresol Red factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | O-Cresol Red is packaged in a 25g amber glass bottle with a secure screw cap, labeled with hazard and handling information. |
| Shipping | O-Cresol Red is shipped in securely sealed containers to prevent leakage and contamination. It is typically packaged in compliance with chemical safety regulations, labeled appropriately for laboratory use. The packaging ensures protection from moisture, light, and extreme temperatures. Safety Data Sheets (SDS) accompany the shipment for proper handling and emergency guidelines. |
| Storage | O-Cresol Red should be stored in a tightly closed container in a cool, dry, well-ventilated area, away from incompatible substances such as strong oxidizing agents. Protect it from light and moisture. Avoid exposure to heat or direct sunlight. Store at room temperature and label the container appropriately to prevent accidental misuse or contamination. |
Competitive O-Cresol Red 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
Email: sales2@liwei-chem.com
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Working on the factory floors and labs, we handle O-Cresol Red at every step—forming, purifying, and packaging. The hands-on process informs why we rely on it, and what distinguishes it from other pH indicators. O-Cresol Red’s deep, clear color transitions make life easier for anyone observing pH changes, whether the task is technical water analysis or biochemical research.
We manufacture O-Cresol Red following rigorous in-house protocols, grounded in years of chemical expertise and domestic batch experience. Its molecular formula, C21H18O5S, offers distinctive orange-red crystalline granules. Color strength remains stable over extended storage when kept in sealed glass or plastic under standard ambient conditions.
We do not cut corners during purification, and we pay serious attention to minimize organic and inorganic impurities. When a sample from our reactors comes out, we check it for peak absorbance spectrum and pH response using high-precision spectrophotometers. Only samples meeting our set baseline—color transition range (approximate pH 1.2 to 2.8 from red to yellow, and pH 7.0 to 8.8 from yellow to violet)—move forward to packing. This commitment ensures that the indicator performs with predictability, an often overlooked point, unless one has seen the frustration poor color transition causes in a lab.
Our own conversations with plant operators, water utilities teams, and university researchers reveal nearly all have a unique application story for O-Cresol Red. A process engineer recounted a situation where the indicator’s fast response and sharp color shifts meant no missed endpoint, saving equipment from corrosion. In a biochemistry department, a graduate student described how our O-Cresol Red’s batch consistency gave him steady results during enzyme assays, leading to publishable data rather than headache.
Unlike some indicators, O-Cresol Red covers a wide pH window with two distinct color transitions—red to yellow, then yellow to violet. Many of its chemical cousins, such as Methyl Red or Bromothymol Blue, only display one main color shift, limiting their use in titrations that span more than a narrow pH range. For complex samples where the endpoint may not land exactly at pH 7, or when someone needs to monitor near-neutral transitions, O-Cresol Red has proven invaluable.
On the floor, we see how indispensable it is to deliver a material that behaves predictably in every bottle. Finished lots are compared in parallel, and outliers never make it past quality control. Bulk purchasers—municipal labs, industrial plants, commercial water treaters—prefer O-Cresol Red from our units not out of habit but because they see less batch variation. Guidebooks may cite certain number ranges, but the hands that weigh and blend the chemical know that material purity ensures those numbers are real and usable.
Color indicators serve more than textbook titrations; they safeguard multimillion-dollar systems. If an indicator fades, or if color transition lags, process errors creep in. Few outside a manufacturing plant realize that indicator consistency saves resources, rights production streams, and frees technical talent to spend less time troubleshooting.
Lab managers and analytical chemists scanning catalogs ask us why bother choosing O-Cresol Red over cheaper alternatives. Decision points often revolve around the indicator’s pH range, color contrast, solubility, and longevity. O-Cresol Red’s double transition gives lab techs room to monitor pH outside a locked-in range—critical in titrations where both acidic and near-neutral endpoints matter.
Ease of reading does not come from chance. We engineer particle size for sure dispersion. Our crystallization process gives each batch a fast, uniform dissolution profile, so the color emerges vigorously and nothing hangs as undissolved clumps. Few realize the frustration when a color indicator refuses to dissolve on first use, leading to wasted minutes and possible errors. Our experience on the production bench shaped a pursuit of free-flowing, dust-minimized granules.
We select container materials to preserve O-Cresol Red’s potency. Exposure to light, air, and humidity silently degrades quality over time, especially for chemical indicators. Years of monitoring real-world shipments proved PET and high-grade glass jars keep indicators ready for sudden lab draws, even after months in storage. Worse materials show a gradual fade or clumping that tells any sharp-eyed lab tech the indicator lost edge—no one on our staff will ship such a batch to avoid damage to users’ reputations and results.
Every large volume reagent room runs into the issue of shelf life. Stabilizers are considered (useful in some settings), but we found rigorous drying and double-sealed packaging does more for color fastness than unnecessary chemical tweaks.
O-Cresol Red has been a staple in water quality checks, with particular strength in municipal and industrial waste screening. From personal observation, technicians rely on the double endpoint because water sources often shift pH values unexpectedly—sometimes acidic, sometimes approaching neutrality. Our clients in city water labs stress that a single indicator cannot always guarantee proper endpoint for diverse samples; O-Cresol Red can.
In swimming pool management and aquarium care, the indicator’s predictable color windows mean less guesswork. Water companies performing regular checks see consistent matches against standards, cutting time spent reviewing dubious results.
Adoption in the life sciences continues to expand for O-Cresol Red. Enzyme activity assays, buffer capacity measurements, and even emerging diagnostic test kits often call for an indicator with robust, high-visibility transitions. The difference in performance becomes clear in 96-well plate readings, where precise color separation can distinguish a promising experiment from a failed one. Manufacturers who supply indicators without regard to grade or batch equivalence introduce headaches downstream, but matching our in-house standards to user stories in the biolab keeps feedback loops healthy and improvements ongoing.
Methyl Red covers pH 4.2 to 6.3, coloring a solution orange to yellow. Phenol Red, used in cell culture, shifts at pH 6.8 to 8.4, from yellow to red. Both serve their niche. Direct experience shows problems arise when these indicators are forced into service in mixed pH samples. O-Cresol Red’s double window simplifies labs with unpredictable sample conditions; it signals both acidic and light alkaline transitions in one operation, eliminating the need to switch halfway or run redundant tests.
Strong endpoint color visibility matters. Reading the endpoint, especially in turbid fluids or with microplate formats, depends on color intensity and minimal interferences. O-Cresol Red’s unique chromophore backbone produces solid color intensity at low concentrations, fuelling its rise in analytical procedures where sample amounts are costly or limited. These strengths led some industrial clients to redesign test methods around its properties.
Producing O-Cresol Red involves more fine-grained quality control steps than seen in many indicator processes. Sourcing high-grade raw cresol matters. If we detect too much ortho-cresol isomer content, unwanted side products can form, directly harming the final color profile or pH response sharpness. Years of hands-on batch work confirmed: tight raw material constraints equal less rework, less waste, and no remorseful apologies to clients expecting the usual high standard.
Grinding and sieving play their part. We focus on particle-size uniformity for full dispersion and quick solubilization at point of use. This attention to process detail emerged after direct customer feedback, where complaints of “floaters” or “overly dusty indicator” revealed overlooked trouble in the production line.
Every production run ends with side-by-side comparisons between new and reference samples in standard pH buffers. Our staff judge color transitions by eye and by digital colorimetric methods. This step matters because technicians in the field cannot afford indicator-to-indicator uncertainty. They need to trust that a new bottle performs within expectations set by previous batches. The loyalty we get from university and municipal accounts ties directly to these repeatable results.
Chemical indicators rarely get the limelight for breakthroughs, but real-world users need trusted performance. Drifts in pH response or color recall lead to downstream errors. Having manufactured, tank-filling, and packed this compound for years, one thing stands out: the risk of “indicator drift” never balances against a cut in the QC step.
As laboratory automation spreads, indicators with unreliable transition points jam up progress. Our work with analytical device manufacturers shaped new packaging and batch tracing for O-Cresol Red. Consistency supports robotic liquid handlers and spectrophotometers interfacing with small batch kits; anything less creates expensive troubleshooting cycles. Automated systems bank on the reliability of physical and chemical characteristics from one lot to another, so our standard operating procedures do not prioritize speed at the expense of steadiness.
The rise of digital recordkeeping lets us link every vial to batch data: lot, date, and analytical logs. That level of transparency enables users to trace back issues or verify performance fast. For high-throughput biotech and contract testing labs, these touchpoints save countless hours, and feedback from such users spurs us to make continuous refinements in both process and documentation.
Temperature and humidity swings during storage and shipping shape quality more than many realize. Warehouses with faulty HVAC systems compromise shelf stability. We field calls from users troubleshooting why a faded or damped bottle won’t color as promised; in nearly all cases, storage out of firm environmental limits caused the issue. Our answer includes robust, tamper-evident seals and printed lot-traceable labels.
Some research users asked about possible degradation by UV exposure, since light can slowly weaken O-Cresol Red’s structure. This point comes from years of experience, not textbook warning—scratched or thin glass lets UV in, while amber vials or foil pouches kept in cardboard consistently outperform others in preservational tests.
Analytical service providers dealing in occasional water testing find O-Cresol Red appeals for reliability over long shelf times. Research users in enzyme or buffer studies benefit from high color intensity with low indicator additions per sample, minimizing background absorbance in sensitive assays.
Routine titrations in teaching labs showcase clear color changes, an advantage for students learning to interpret chemical endpoints. The double transition also extends useful life since less indicator is wasted switching brands or products halfway through a testing run.
Anyone thinking indicators are all alike soon learns that layer upon layer of refinement—from starting material selection to final packaging—builds trust. Years of customer feedback, returned samples, and partnership with analytical chemists shaped how our O-Cresol Red lineup outperforms competitors. We aim not for the minimum spec, but for a product that field users, trainees, and research professionals all trust during high-stakes analysis.
Some suppliers opt for a more general-purpose blend, but as a chemical manufacturer, we feel the choice to maintain dedicated lines with strict specs draws a clear line between bulk commodity and premium indicator. Not every buyer requires this, but those who have dealt with instrument drift, questionable results, and inconsistent endpoint color rarely look back.
As more segments shift toward automation and high-throughput analysis, color indicators face new scrutiny. Color intensity, solubility, and batch data must align with machine learning-enhanced labs and process analytical systems. Labs and manufacturers have started sharing more granular QC data for every batch—what might have been internal years ago now finds its way into digital tracking and remote audits.
We introduce periodic reviews into our own lines, benchmarking competitor offerings and integrating user trial feedback. Adjustments happen not to outpace regulations but to tighten performance, driven by the feedback loop that comes from close relationships with our users. In tough economic periods, ingredient cost management and batch yield gains help hold pricing steady for long-serving customers. This balance matters, making quality O-Cresol Red approachable to more labs, not only flagship research centers.
Problems serve as sparks for better batches. A lesson learned from cleaning spilled indicator off concrete led to updated spill kits and training for pack-line operators. Addressing customer reports on clumping led to refinements in drying and sieving. Improved packaging born of shipment breakage stories now gives greater shelf confidence.
Every change originates from actual handling, technical advice from experienced users, or stubborn QC issues. Updates never happen in abstraction—they respond to someone’s real world, often solving one problem before it multiplies elsewhere.
Much of O-Cresol Red’s story in our company emerges from the tension between traditional production and ever-fillip environments found in end-user labs. For every bottle sent out, there’s a process engineer, a research scientist, a teacher, or a water treatment specialist relying on one simple promise: what works this month works next month, too.
Our approach takes these needs to heart. Years on the manufacturing floor have cemented the view that attention at every stage—raw material selection, refining, drying, sieving, packaging and testing—cements a bond with those who depend on O-Cresol Red to anchor their daily analysis. That’s why, for us, making a good indicator is less about the chemical formula and more about standing behind every lot as a reflection of our corporate values and direct manufacturing experience.
