The gold numbers of protective colloids A,B,C and D are 0.04,0.004,10 and 40 respectively. The protective powers of A,B,C and D are in the orders .
The gold numbers of protective colloids A, B, C and D are 0.04, 0.004, 10 and 40 respectively. The protective powers of A, B, C and D are in the order: