The plasticizer may be an alcohol, such as polyethylene glycol, sorbitol, or glycerol, preferably being polyethylene glycol having a molecular weight ranging from about 200 to 1000 D, preferably being about 400 D. The plasticizers will be present in the compositions at from about 1% of the solids by weight to 20% of the solids by weight, usually from 3% of the solids by weight to 15% of the solids