Greetings I had been using Fotoboard, but picked up 4 pieces of this EverMuse Presensitized 150X250mm 1oz 1/16 Double Sided~ on the cheap. I've tried two pieces now, and both have left me a bit boggled. They expose, and develope fine. But in CuCl2 etchant, even after 24hours in KNOWN GOOD etchant (15% 120DegF / Bubble (30% hcl 1:1 with Deionzized water and a 1/2tsp 30% h202, Currently a lovely lime green color)~ Is still not fully etched. A thin dull pink film of copper is left, and is still very conductive. The second one, I tried for a couple of hours, then whipped up a small new batch of roughly 20% HCL wth 1/4tsp 30% h202, Turned green in just a little under 5 min with the board, but still no further etching than the first board. I've tried putting the first board (rinsed) back in the developer for an extended time, then (rinsed)and back in the etch- it just etched away my traces, but still leaves this superthin pink layer. I dont believe it's under exposed, or it would not have etched the top portion of copper, and at anypoint there is surly no photo resist surviving on the pcb after 1/2 hour in a fresh batch 10:1 MG Chems developer. I'usually mix it much thinner, more on 16:1 and this works fine with Fotoboard, But I was on a quest to see the fiberglass after 24hrs. Anybody else having this type of problem with these (cheap-er) pcb's? Tomorrow I will get some Fe and see If I cant make some insulators.
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Problems with Ever-Muse PCB's vs CuCl2
2004-02-15 by cdaw01
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