Manufacturers and Suppliers of Chemicals, Reagent Ltd

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Chemical Indicators

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At ReAgent, we supply many different chemical indicators. Most of our customers buy them in dilute forms, however we can also supply chemical indicators in concentrate and pure forms. Many of our indicators are kept in stock and can be dispatched quickly. If you don’t see exactly what you require, such as a different pack size or different concentration

Although this is not a definitive list of what we can provide, some of the most popular Chemical Indicators we supply include:

• Bromocresol Green
• Bromocresol Green 0.04%
• Bromocresol Purple
• Bromophenol Blue
• Bromophenol Blue 0.04%
• Bromothymol Blue
• Bromothymol Blue 0.04%
• Crystal Violet
• Dimidium Bromide
• Dimidium Bromide/Disulphine Blue
• Eriochrome Black T
• Ferroin
• Gentian Violet
• Giemsas Stain Powder
• Iodine Indicator
• Methyl Orange LRG
• Methyl Orange 0.1%
• Methyl Orange 0.04%
• Methyl Orange/Xylene Cyanol
• Methyl Red
• Methyl Red 0.01%
• Methyl Red 0.04%
• Methylene Blue
• Morphine 0.5M in Methanol
• Phenolphthalein
• Phenol-Sodium Nitroprusside Indicator
• Starch Solution 0.25%
• Thymol Blue
• Thymol Blue 0.04%
• Thymolphthalein
• Thymolphthalein 0.5%
• TISAB
• Total Hardness Indicator
  

Chemical Indicators are used to indicate the existence, or non-existence, of a substance in a solution. A visible change in colour when a solution reaches a particular pH range is a common indication. Phenolphthalein is a widely used example of one of the most common Chemical Indicators. When added to an aqueous solution, it will remain colourless until the pH falls into a range from pH 8.3 to pH 10, when it turns pink in colour. Examples of where this test is used include the production of biodiesel and milk.

In many cases, only a very small amount of the Chemical Indicator is required. Taking the example of Phenolphthalein again, a solution of 1% or 2% is well strong enough. Using a dilute solution increases accuracy, not to mention improves safety as dilute solutions are less hazardous.