Preservative for milk samples whose composition is to be examined, and process for examining milk samples using the preservative

摘要

Electrostatic liquid developer having improved negative charging characteristics consisting essentially of (A) nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount, (B) thermoplastic resin particles having an average by area particle size of less than 10 mu m, (C) charge director compound, and (D) at least one soluble solid or liquid organic monofunctional amine compound of the formula: RnNH3-n wherein R is alkyl, cycloalkyl or alkylene, or substituted alkyl, the alkyl, cycloalkyl, alkylene or substituted alkyl group being of 1 to 50 carbon atoms, and n is an integer of 1 to 3. Optionally, a colorant, e.g., a pigment; metallic soap, adjuvant can be present. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.