Procedure
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Italy
Known as an Italian recipe, with similar versions prepared across other nations.
Ingredients 1 ingredient
- 250 ml water
Cook safely
Keep children and pets away from the hob and the oven, and keep oven gloves and a lid within reach.
- Boiling water and steam. Turn pan handles inward, away from the edge of the hob. Lift lids away from you, and pour hot water away from your body: steam burns too.
Method
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- Accurately weigh approximately 5 g of the lake into a 500 ml beaker.
- Add 250 ml water and 60 ml concentrated hydrochloric acid.
- Boil until all the colour and alumina has dissolved.
- Filter through a tared No.
- 4 sintered glass crucible.
- Wash the crucible with hot 0.5% hydrochloric acid until the washings are colourless.
- Dry the crucible to constant weight at 135*.
- Express the weight of residue as a percentage of the weight taken.
Plating
Cookware for this recipe
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Saucepan