On Jan 28, 2008, at 9:21 AM, Denny Esterline wrote:

> When you first mix the HCL and H2O2, the etch chemistry is,
> basicaly, free chlorine. Nasty, nasty stuff. But once you've added  
> a fair
> bit of copper it becomes a mixture of copper chlorate

Copper chlorIDE.  Copper chlorate explodes; avoid it!

(and yes, copper chloride etchant is pretty neat stuff.)

BillW

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