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purple-grey Screened methyl orange (second transition) purple-grey 3.2 4.2 green Bromocresol green: yellow 3.8 5.4 blue Methyl red: red 4.4 6.2 yellow Methyl purple: purple 4.8 5.4 green Azolitmin (litmus) red 4.5 8.3 blue Bromocresol purple: yellow 5.2 6.8 purple Bromothymol blue: yellow 6.0 7.6 blue Phenol red: yellow 6.4 8.0 red Neutral red ...
Methyl violet 10B has six methyl groups. It is known in medicine as Gentian violet (or crystal violet or pyoctanin (e) [2]) and is the active ingredient in a Gram stain, used to classify bacteria. It is used as a pH indicator, with a range between 0 and 1.6.
Low pH colour Transition pH range High pH colour Thymol blue (first transition) Red 1.2 – 2.8 Yellow Methyl orange: Red 3.2 – 4.4 Yellow Methyl red: Red 4.8 – 6.0 Yellow Bromothymol blue: Yellow 6.0 – 7.6 Blue Thymol blue (second transition) Yellow 8.0 – 9.6 Blue Phenolphthalein: Colourless 8.3 – 10.0 Fuchsia
Bromocresol purple (BCP) or 5′,5″-dibromo-o-cresolsulfophthalein, is a dye of the triphenylmethane family (triarylmethane dyes) and a pH indicator. It is colored yellow below pH 5.2, and violet above pH 6.8.
Bromothymol blue ( pH indicator) below pH 6.0. above pH 7.6. 6.0. ⇌. 7.6. Bromothymol blue acts as a weak acid in a solution. It can thus be in protonated or deprotonated form, appearing yellow or blue, respectively. It is bright aquamarine by itself, and greenish-blue in a neutral solution.
Indicator for cell cultures. Phenol red, 40 μM: colors in cell culture medium at a pH range from 6.0 to 8.0. Most living tissues prosper at a near-neutral pH—that is, a pH close to 7. The pH of blood ranges from 7.35 to 7.45, for instance.
Crystal violet ( pH indicator) below pH −1.0. above pH 2.0. −1.0. ⇌. 2.0. Solid crystal violet. Crystal violet in aqueous solution. When dissolved in water, the dye has a blue-violet colour with an absorbance maximum at 590 nm and an extinction coefficient of 87,000 M −1 cm −1. [8]
pH indicator. Phenolphthalein ( pH indicator) below pH 8.3. above pH 10.0. 8.3. ⇌. 10.0. Phenolphthalein's common use is as an indicator in acid-base titrations. It also serves as a component of universal indicator, together with methyl red, bromothymol blue, and thymol blue.
below pH 3.8. above pH 5.4. 3.8. ⇌. 5.4. Bromocresol green ( BCG) is a dye of the triphenylmethane family ( triarylmethane dyes ). It belongs to a class of dyes called sulfonephthaleins. [4] It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.
Tashiro's indicator is a pH indicator (pH value: 4.4–6.2), mixed indicator composed of a solution of methylene blue (0.1%) and methyl red (0.03%) in ethanol [1] [2] [3] or in methanol. [4] It can be used e.g. for the titration of ammonia in Kjeldahl analysis .