>>761022 So, look for someone who has a ceramics set up and has an annealing oven.
As for what type of paint to use, I am not sure. You will have to silkscreen it whatever it is. There is very little information available online about how this process works. You may have better luck searching through historical books on the glass manufacturing process.
>>761173 1000F then. It is a manufacturing process that was started in the 1930s for applying painted labels to bottles. I am sure there are plenty of hobbyist products on the market for doing similar work, but those glasses were not made with that process.
As for the paint, it is probably made of some sort of powdered glass or ceramic derivative.
Glass/ceramic decals. Typical firing range is about 1000ºF, not Celsius. Low temp decals can be obtained for ~300-400ºF. Send PDF to a company that prints them, orrr silkscreen/resist transfer china paint enamel on ceramic decal paper yourself.
>>761195 Heres a reference. http://www.bottlebooks.com/ACL%201937/bottles_applied_color_labels.htm
"The color is applied in the form of a paste‑like material, through a screen of silk, in which the design has been formed. The bottle which contains the impression of that design must then be dried and then fired by conducting it through a lehr, which is a long, tunnel‑like enclosure through which the bottles pass at a carefully controlled rate of speed and in which definite zones of temperature are maintained. The maximum temperature chosen is such that the glass body will not melt, but the softer glass involved in the color will melt and rigidly fuse on the glass beneath it"
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