METHOD OF PRODUCING AQUEOUS COLOURING AGENT FROM PLANT RAW MATERIAL Russian patent published in 2016 - IPC C09B61/00 

FIELD: food industry.

SUBSTANCE: invention relates to production of natural food colouring agents from vegetal raw materials and can be widely used for colouring various substrates. Described is a method of producing an aqueous colouring agent from plant raw material - Manchurian nut pericarp in consumer or milky ripeness. Method involves preparation of the above said vegetal raw material using drying at 105 °C during 3 hours or freezing and grinding to the grain size of not more than 3 mm. Prepared raw material is extracted with distilled water at 100 °C and the hydromodulus of 1:5 for 5 minutes. Extraction product is cooled down to 23 °C. Colouring agent is separated in the form of a filtrate from the extract-containing material.

EFFECT: invention provides reduced duration of the process of producing the colouring agent and wider raw material base for its production.

1 cl, 1 dwg, 2 tbl, 6 ex