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At the edge of your board outside the final area place a small piece of aluminum foil. That way you have a spot without any exposure at all. Similarly cut a small notch in your artwork or have one side smaller than the PCB. That way you get an area with 100% exposure without any loss through the artwork. Those two areas will work as a process reference and they have 100% contrast. If they are good, then the issues are with the artwork.
Bertho
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Friday, August 29, 2014 07:53
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] help request: disappointing etch resist development
On 29/08/2014 12:49, mattmoose1969@... [Homebrew_PCBs] wrote:
> Hi Leon,It might not have enough contrast, try using LaserStar film. I think
>
> I'm laser printing the artwork onto 90gsm tracing paper, as recommended
> by someone who has done a lot more of this than I have.