Rick:
Have you opted against the bubble agitation system altogether?
Sounds like a simple and logical method the way it was presented.
Howard
On 11/23/2012 01:14 PM, Rick Sparber wrote:
> A friend looked at my pictures of my failed etchings and suggested I lower
> my UV light and greatly extend the exposure time. I went from 7" down to
> 2.5" and from 1 minute to 8 minutes. HUGE improvement. My first test piece
> was done etching in 9 minutes with the ferric chloride at about 75F. The
> second test piece used the same set up and chemicals but the acid sat out in
> the Arizona sun for about 15 minutes so must have warmed up. It etched in
> 5.5 minutes.
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> My next test cycle will be with all the same except I will try using
> convection etching.
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> Rick
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