Composite glass articles spontaneous opal glass and enamel of Li.sub.2 -O-B.sub.2 -O.sub.3 -TiO.sub.2 -ZrO.sub.2 -PbO-SiO.sub.2

A composite article consisting of an opal glass body exhibiting a dense, milky-white appearance and an adherent enamel demonstrating high gloss and exceptional chemical durability, said opal glass consisting essentially, in weight percent on the oxide basis, of about 8-13% Na.sub.2 O, 5-9% Al.sub.2 O.sub.3, 74-78% SiO.sub.2, and 3.5-4.5% F as analyzed, and said enamel having a flux composition being essentially free from alkali metal oxides other than Li.sub.2 O and consisting essentially, in weight percent on the oxide basis, of about 0.5-3% Li.sub.2 O, 4-8% B.sub.2 O.sub.3, 1-5% TiO.sub.2, 3-8% ZrO.sub.2, 45-55% PbO, and 28-38% SiO.sub.2, wherein opal glass exhibits softening point in excess of 760.degree. C., a strain point in excess of 490.degree. C., and a coefficient of thermal expansion (0.degree.-300.degree. C.) of about 66-75.times.10.sup..sup.-7 /.degree. C., and wherein said enamel flux exhibits a coefficient of thermal expansion (25.degree.-300.degree. C.) about 3-10 points lower than that of said opal glass, a lead release after chemical attack of less than 2 .mu.g/cm.sup.2, and will fire to a high gloss in less than about ten minutes at temperatures below 720.degree. C.