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Crystal violet or gentian violet, also known as methyl violet 10B or hexamethyl pararosaniline chloride, ... Crystal violet (pH indicator) below pH −1.0: above pH 2.0:
It is known in medicine as Gentian violet (or crystal violet or pyoctanin(e) [1]) 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. The protonated form (found in acidic conditions) is yellow, turning blue-violet above pH levels of 1.6. [4]
Another example of a leuco dye is the crystal violet lactone, which in its lactone form is colorless or slightly yellowish, but in low pH, when it is protonated, it becomes intensely violet. [1] Other examples are phenolphthalein and thymolphthalein , colorless in acidic to neutral pH, but becoming pink and blue in alkaline environment.
Crystal violet – 0.001 g; Agar – 13.5 g; Water – add to make 1 litre; adjust pH to 7.1 +/− 0.2; Sodium taurocholate; There are many variations of MacConkey agar depending on the need. If the spreading or swarming of Proteus species is not required, sodium chloride is omitted.
In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...
US President Donald Trump looks on after delivering remarks at the House Republican Members Conference Dinner at Trump National Doral Miami, in Miami, Florida on January 27, 2025.
Pigment violet 29 Pigment brown 26 71129 perylene 81-33-4: Ponceau 2R: Xylidine ponceau Acid red 26 Food red 5 16150 azo 3761-53-3: Ponceau 3R: FD&C Red No. 1 Food red 6 16155 azo 3564-09-8: Ponceau 4R: Cochineal red A Brilliant scarlet 3R Acid red 18 16255 azo 2611-82-7: Ponceau 6R: Crystal scarlet Crystal ponceau 6R Brilliant crystal scarlet ...
(The Center Square) – New bipartisan legislation that would assist lower-income students in paying for job training programs could inadvertently be rendered useless if President Donald Trump has ...