Methvl Violet TS
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Italy
Known as an Italian recipe, with similar versions prepared across other nations.
Ingredients 2 ingredients
- 35 ml water
- a glass mortar
Method
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- See chrystal violet TS.
- Millon' s TS To 2 ml of mercury in an Erlenmeyer flask add 20 ml of nitric acid.
- Shake the flask under a hood to break up the mercury into small globules.
- After about 10 min add 35 ml of water and, if a precipitate or crystals appear, add sufficient dilute nitric acid (1 in 5, prepared from nitric acid free from the oxides which have been removed by blowing air through it until it is colourless) to dissolve the separated solid.
- Add sodium hydroxide solution (1 in 10), dropwise, with thorough mixing, until the curdy precipitate that forms after the addition of each drop no longer redissolves but is dispersed to form a suspension.
- Add 5 ml more of the dilute nitric acid, and mix well.
- Prepare this solution fresh.
- Mur exide Indicator Preparation Add 0.4 g of murexide to 40 g of powdered potassium sulfate, and grind in a glass mortar to a homogeneous mixture.
- (Tablets containing 0.4 irg of murexide admixed with potassium sulfate or potassium chloride are available commercially.
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Plating
Cookware for this recipe
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Mortar and pestle