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I’m trying to wrap my head around how this works, to better mix it. I actually like working with this method – the resulting etchant is way less unpleasant than ferric or the HCl/peroxide stuff. It is way slower, although I’ve found adding peroxide/salt seems to speed things up a bit.
The only negative I’ve found is that peroxide typically is only available in small 300-500ml bottles, which depending on which store you raid cost anywhere from $1.99 to $3.99 CDN each. And you kinda get weird ‘is this guy a terrorist?’ looks when you check out six or eight of em at a time. I’ve looked around for ‘bulk’ peroxide but have only found industrial stuff that is at 32% (vs 3%).. wondering how that would change things in the reaction?
I’m also wondering why it seems like I can keep the reaction going indefinitely if I constantly intervene to stir, add a bit of salt, add peroxide, etc.. but once I let it go it cannot be restarted again. Also curious why sometimes I get a blue coloured etchant at the end, whereas other times I get this foamy, nasty green.
I’d love to figure this out more and refine it. The real obstacle is the cost and small quantities available of peroxide. I’d love to find a way to buy that that doesn’t leave me feeling like a weirdo. J
Brad