Examples thereof include aliphatic hydrocarbons such as hexane, heptane; aromatic hydrocarbons such as toluene and xylene; various petroleum fractions having a suitable boiling point range; esters such as butyl acetate, ethylene glycol diacetate and 2-ethoxyethyl acetate; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; alcohols such as butanol; and mixtures of these solven