Papers containing ____________ that reduce CUSO4 might be utilized, provided the total reducing power of the additives is known and no more than about 75% of the total reducing power of the sheet.

Papers containing ____________ that reduce CUSO4 might be utilized, pr

1.	Papers containing ____________ that reduce CUSO4 might be utilized, provided the total reducing power of the additives is known and no more than about 75% of the total reducing power of the sheet.
A.	a)ZnS and CaSO4
B.	b)ZnSO4 and CaCO3
C.	c)CaCO3 and MnO2
D.	d)ZnS and CO2
Answer» B.