Re: Technical questions on etching and annealing

another possibility might be that the rougher sides caused more air pockets/bubbles in the etching medium so didn't etch as completely. when i etch i always 'work' the acid to alleviate this problem.?? m

> 1. Is it generally true that opaque glasses etch more easily/evenly than > > transparent glasses? > > As opal glasses have a second phase which is crystalline, it can well be > that this is more easily attacked by the etchant than is the body glass. > There are two main types, fluoride and phosphate opals. > -- > Terry Harper >
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Michele Blank
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All:

Thanks for the comments. Just for the record --- yeah, I'm very careful with this stuff. I actually have (back in university days) used HF acid to do glass etching (non-artistic), was quite rightly paranoid/careful with the stuff. It's nasty.

I'm pretty sure that the effects I'm seeing are not related to either the glass being dirty at start, or to pieces touching each other or the sides of the container. From the responses I'm getting here and other places, it seems like my thoughts about different annealing states affecting the etching properties are at least plausible...

Thanks for the responses --- and other people's thoughts and observations are still quite welcome! I'm still watching!

--Dave

vermiculite)

Reply to
D Brock

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