> I found cupric chloride to be very slow at room temp, it benefits from heating even more than FeCl. HCl + peroxide certainly works fine at room temp though, until enough of it converts.
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I have never heated mine before. In fact I have it on the back porch and have etched boards fine in cold weather. I just pump lots of air into it. Sometimes add a little HCl if it seems to be slower than normal. I kept it covered when not in use but can still vent. So times will leave it uncovered to reduce it down some. I normally don't add any peroxide.
Ben