METHOD OF PRODUCING EMERALD CHROME PIGMENT Russian patent published in 2010 - IPC C09C1/34 

FIELD: chemistry.

SUBSTANCE: method of producing emerald chrome pigment involves calcination of a mixture containing chromic anhydride, boric acid and urea, subsequent washing and drying the pigment. The mixture is calcined at temperature 750-800°C for 0.5-1.0 hours to obtain a melt which is boiled with addition of boric acid in mass ratio of melt to solution equal to 1:6. The mixture has the following weight ratio of ingredients: chromic anhydride - 20 pts. wt, boric acid - 60-80 pts. wt, urea - 3-4 pts. wt.

EFFECT: obtaining green pigment with a tinge of emerald green.

1 ex