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Subject: Re: [Homebrew_PCBs] Re: Out-of-date pre-coated boards

From: DJ Delorie <dj@...>
Date: 2008-06-06

Matthew Smith <matt@...> writes:

> of parallel lines. Partially cover the strip, expose for a minimum
> length of time. Uncover a bit more strip, expose for a little longer.

Or just get a step transmission gauge and calibrate your exposure.