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Technical questions on etching and annealing



 
 
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  #1  
Old June 30th 03, 10:28 PM
Michele Blank
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Default 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


"Terry Harper" wrote in message
...
"D Brock" wrote in message
...

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
http://www.terry.harper.btinternet.co.uk/



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  #2  
Old July 1st 03, 02:31 AM
kitty
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Default


"Michele Blank" wrote in message
...
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


"Terry Harper" wrote in message
...
"D Brock" wrote in message
...

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
http://www.terry.harper.btinternet.co.uk/




That does indeed help. Another thing to watch is the cleanliness of item to
be etched. Make sure there is no grease residue or handling residue [from
hands/fingers] etc...it can act as a 'block' to the etching.

Kitty


 




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