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Subject: Re: [Homebrew_PCBs] Dry film- negative resist... First attempt failure

From: DJ Delorie <dj@...>
Date: 2008-10-20

> Patience and thinking backwards can replace a step gauge while using
> a single board.

True, but a step gauge tells you the ∗desired∗ exposure, not just
"something that works". They're pretty cheap too.