After WW2 the technology which enabled Heat Transfer Decal (HTD) to be applied to containers which are preheated to 250 degrees, became available to bottle manufacturers. This type of bottle became popular in the cool drink and dairy industries. Labels were automatically applied with a paper transfer label plus chemicals which had heat applied to create the pyro or ceramic label on the bottle.
Complex artwork containing several colors can be used in this process. The end result is a durable label with consistent registration. Western Australia possesses a wide cross section of both imported and locally made pyro milk and cool drink bottles to collect as this form of embossing was used widely locally after WW2.