| http://www.w3.org/ns/prov#value | - rbon atoms, or a sorbitan ester of the formula ##STR7## where each of p, q, r and s is an integer and the sum of said integers is from 0 to 40, and R1 is H or --COR2, and R2 is alkyl, alkylphenyl, or dialkylphenyl wherein the alkyl groups have from 5 to 30 carbon atoms; or where x and y are from 0 to 40 when when R is --NH(CH2)3 O--R3, or ##STR8## where R3 is H or R4, and R4 is alkyl, alkylphenyl,
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