Abstract: Latex agglutination test methods and kits. Employing dyed latex polymer particles and adding a water-soluble, non-latex polymer particle absorbing dye contrasting in color to the dyed latex polymer particles produces a reaction mixture that changes color when agglutination occurs. Direct and indirect latex agglutination tests are contemplated which are useful in detecting disease states or physiological states such as pregnancy.

Abstract: The thermoplastic polymer employed in this invention is a rubber modified unsaturated carboxylic acid or anhydride containing polymer which is prepared by polymerizing the monomers in the presence of the rubber in a finely divided form. The surface to be metallized is first aminated with aqueous hydroxylamine or hydrazine, then treated with a noble metal salt solution and thereafter treated with a reducing agent, as needed, to produce a metallized surface having a resistance of 100 ohms/sq. or less. The metallized surface can then be further plated by conventional means.

Abstract: A nonreversible freeze-thaw indicator which will detect whether an article has been subjected to freezing or thawing conditions comprising an encapsulated translucent to opaque colloidal dispersion of organic solid particles suspended in a liquid medium, said colloidal dispersion having the property of becoming nonreversibly destablized upon freezing which thereafter provides a telltale visual sign if said dispersion rises through its freeze-thaw temperature. After the colloidal dispersion has once been frozen to trigger its irreversible destabilization and is again thawed, it coagulates to form a non-flowing waxy gel, flocculates and precipitates leaving a clear liquid and a coagulated solids layer or partially flocculates to transform a translucent dispersion to a substantially opaque dispersion.