I`ve tried AP, FC, and muriatic acid/peroxide. I prefer Ferric Chloride just because it makes the cleanest etch. acid/peroxide next, because it's pretty fast and cheap. AP last, because it seems to take forever. Heating the solution doesn't seem to help. Both AP and Acid/Peroxide manage to get past my toner transfer etch resist a bit and will give a slight rash.
Add more peroxide. That should "sharpen" your etch.
With Ammonium Persulphate I make the solution with boiling water and it literally etches in 5 minutes.
Pommie, unfortunatly you are dead wrong, no solution of disolved metals can be simply thrown down the drain legally in any state in the US and probably violates your residental sewer discharge permit. Unforuntaly your mindset is so prevalent I'll probably go down in flames for being right. Many cities and villages simply discharge their sewer water into local waterways, only some of the larger cities have waste water treatment plants for their sewer effluent, and that's only because so many people throw things down the drain they shouldn't that they have to because the final discharge point of a larger city becomes an unlivable cesspool.
Cadmium 0.21 mg/L
Chromium 6.89 mg/L
Copper 6.59 mg/L
Cyanide 1.9 mg/L
Lead 0.01 mg/L
Mercury 0.01 mg/L
Nickel 2.82 mg/L
Silver 1.2 mg/L
Zinc 17.85 mg/L
Fat/Oils 100.0 mg/L
Total Toxic
Organics 2.13 mg/L
pH range 6.0 to 10.0 pH units
Using 1 liter of etchant, if you etch a 6x6 2 sided board using 1oz per side board loosing 50% of the copper, you are flushing 1 oz if dissolved copper. If you only etch 1 board or equivalent with this liter before dumping it, you would be flushing ~1600mg/L (WAY more than the 6.59 limit WITH a purchased industrial discharge permit..
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