The present invention provides a composition comprising: i) at least one compound of formula (I): ##STR00001## wherein R.sub.1 and R.sub.2 are independently selected from a group consisting of hydrogen, unsubstituted or substituted C.sub.1-19 hydrocarbyl or a group of formula (II): ##STR00002## wherein Q is a bond or an unsubstituted or substituted hydrocarbyl group; wherein R.sub.3 is selected from a group consisting of hydrogen and unsubstituted or substituted C.sub.1-18 hydrocarbyl; wherein the R.sub.1--C--R.sub.2 backbone is from 5 to 20 atoms in length; wherein each A and B is independently an unsubstituted or substituted unsaturated cyclic hydrocarbyl group; and wherein n is an integer from 0 to 10; and ii) a diluent or carrier; wherein the compound(s) of formula (I) is present in an amount sufficient to provide, at -30.degree. C., at least 1 wt % of iron, based on the weight of the composition.
