It will probably be some sort of acid or silk screening process, not really a paint.
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Hydrofluoric acid (HF) is used to etch glass.
It's sometimes used as an ingredient in cleaners for aluminum wheels -- check the ingredients on some aerosol cans in your local auto parts store.
Search this forum for "glass paint", the subject has come up before, and IIRC, one of the mentioned suppliers had a paint/glaze product that would produce frosted and/or crackled finishes.
I found a manufacture of waterbased paint for glass. They have many different finishes. Conatct them if you require the product. Strata Paint. 450-662-2537