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Subject: Re: [Homebrew_PCBs] Sulfuric acid should remove TT paper.

From: DJ Delorie <dj@...>
Date: 2006-12-11

Borislav Trifonov <bdt@...> writes:

> If you dilute concentrated acid, be careful of flash boiling as the
> dilution is very exothermic.

Always add acid to water, and not water to acid ?