Pyroglaze Milk Bottles

A Missouri Pacific Lines half pint pyroglazed glass milk bottle marked Sunnymede Farm, Bismarck, Missouri

p4A ItemID D9691557
A Mumper's Dairy pyroglazed glass milk bottle with dairy image on front and Drink Krim-Ko Chocolate slogan on back

p4A ItemID D9691549
An I.H. Herr Spring Vale Dairy pyroglazed glass milk bottle from Lancaster, PA with Direct From Farm To You slogan

p4A ItemID D9691541
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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