log p the value of log p of many solvents is often available from the solvent supplier or may be calculated the u201c calculated log p u201d being referred to as c log p for many solvents the value of log p is reported and available from daylight chemical information systems inc daylight cis irvine calif on the pomona 92 database log p values are also conveniently calculated by the u201c c log p u201d program also available from daylight cis the c log p values are determined based on the fragment approach of hansch and leo cf a leo in comprehensive medicinal chemistry vol 4 c hansch p g sammens j b taylor and c a ramsden eds p 295 pergamon press 1990 incorporated herein by reference solvents generally useful for the present invention are those having a partition coefficient of log p of from about 0 70 to about 2 0 the particularly preferred range of log p is from about 1 5 to about 2 0 preferred solvents for use in the present invention are the following the value of log p being indicated alongside in parentheses dipropylene glycol n propyl ether 0 994 tripropylene glycol n butyl ether 1 896 dipropylene glycol n butyl ether 1 523 tripropylene glycol n butyl ether 1 9 and propylene glycol n butyl 1 15 other useful solvents are diols and alcohols such as trimethyl pentane diol 1 24 pentanol 1 3 and hexanol 2 0 preferred mineral electrolytes suitable for use in.