Abstract: Certain solid dye bases which are precursors of acrylic fiber dyes and which contain a tertiary nitrogen atom are effectively quaternized in high yield and purity in a "dry state" quaternization process comprising contacting the dye base with an essentially stoichiometric amount of an alkylating agent at a temperature of 30.degree.-90.degree. C., said alkylating agent being added to said dye base gradually at a rate such that the reaction mixture is a free-flowing solid throughout the reaction.

Abstract: Dyes of the formula: ##STR1## wherein M is a metal selected from calcium and magnesium and provided that where M is calcium the dye is in the beta crystalline form are superior dyes for the dyeing of fiberglass in that they are resistant to crystal growth in dye pastes and recycle process water in the dyeing of fiberglass. Thus, in the spray dyeing of the fiberglass the dyes do not tend to clog the nozzle of the spraying device as do the corresponding salts of monovalent metals, such as the sodium salt.

Abstract: Dyes of the formula: ##STR1## WHEREIN M is a metal selected from the group consisting of calcium, barium, strontium, magnesium, chromium, manganese, iron, cobalt, nickel, copper, and zinc and wherein n is an integer selected from 2 and 3 are superior dyes for the dyeing of fiberglass in that they are resistant to crystal growth in dye pastes and recycle process water in the dyeing of fiberglass thus, in the spray dyeing of the fiberglass the dyes do not tend to clog the nozzle of the spraying device as do the corresponding salts of monovalent metals, such as the disodium and dipotassium salts.