Pyroglaze Milk Bottles

A Romberger's Modern Dairy pyroglazed glass quart size milk bottle with No One Ever Outgrows The Need For Milk slogan

p4A ItemID D9691676
A Hertzler's Dairy pyroglazed milk bottle from Elizabethtown PA with Healthy Herds, added protection slogan

p4A ItemID D9691542
A Sunnyside Farm pyroglazed glass milk bottle from Landisville, PA with graphic of boy with lantern looking for Mumma's Milk

p4A ItemID D9691534
A milkman's strap metal bottle carrier with 12 various glass milk bottles

p4A ItemID E8922623

Pyroglaze Decorated Milk Bottles

A Hertzler’s Dairy pyroglazed milk bottle from Elizabethtown PA, p4A item D9691542

Pyroglazing, or pyro for short, is a type of silk screening decoration introduced in the early 1930s to put colored labels on bottles. Pigments were fused to the glass during manufacture to create colored text and graphic designs. The process was quicker and more cost effective than using molds needed for embossing.

Thatcher Manufacturing referred to the process as pyroglazing. The Owens-Illinois Glass Company used the term Applied Color Labeling or ACL. The advent of colored labels was very appealing to the dairies and farms for advertising purposes making pyro decorated bottles the bottle of choice by the 1940s.


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