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Product details
It is used for colouring food, medicine and daily use cosmetics. Food indigo is a synthetic food colouring. Food colours are a group of additives used for food colouring, including synthetic and natural colours, of which there are more than 60 in total.
Uses of Indigo Carmine.
As a food colouring agent, China's regulations can be used in red and green silk, the maximum use of 0.20g/kg; in fruit juice (flavour) drinks, carbonated beverages, prepared wines, confectionery, pastries on the coloured, dyed cherries canned (Department of decorative), plums, the maximum use of 0.10g/kg; in the maximum use of 0.01g/kg in the dipping of small vegetables.
Food blue pigment. Generally used for colour mixing. Because of its instability, low fastness, weak colouring, the most suitable for dark tones. It can be adjusted to chocolate colour, green, azuki bean colour, tea colour, coffee colour. Used in cakes, cold drinks and refreshing drinks, dosage 5-100mg/kg.
Preparation of Indigo Carmine.
Product Method of Indigo Carmine.
Indigo is made with concentrated sulphuric acid or in combination with a small quantity of fuming sulphuric acid. After sulphonation, it is diluted with an appropriate amount of water, neutralised by sodium carbonate or sodium hydroxide, salted with sodium sulphate or sodium chloride, and then refined to produce
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