> > What is the mix for the Hydrogen Peroxide, Muratic acid for a 'proper > mixture'? (Yea, I'm a newbie, so excruciating details are welcome.) > > IHS ... Jack Here in France it is easy and cheap enough to get "masonry" grade H202 (35% in weight or 130 in volume)used for wood bleaching and stains removal, and HCl (33%), so my recipe for 1 liter is : 750mL water + 50mL H2O2 + 200mL HCl in that order, etching time is about 8 to 10 minutes, this gives time to control the etching and stop it when OK. I have tried with less dilution, but as the solution is exothermic, it produces such a volcano and heat that fine traces can be etched thru or resist lifted before you have a chance to remove the board. But usually I only prepare 1/4 L (250 mL) enough for small boards everytime, as the solution cannot be kept and as it deteriorates rapidly it is best to throw it away. I have made a very small vertical tank by glueing two CD box covers, it contains about 200mL and I dip in boards up to 5x4" (I normally leave as much copper as possible, only etching around the traces) JJ.
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Re: What is the best etching solution;
2009-04-26 by jj_winkel
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