On Friday 22 December 2006 16:31, Lares Moreau wrote: > On Fri, 22 Dec 2006 15:45:23 -0800 > > Tuck Hartshorn <[EMAIL PROTECTED]> wrote: > > http://www.farcircuits.net/supplies.htm > > > > They've done hobby/ham circuit boards for years. I just noticed this new > > listing. Might be of interest. > > tuck > > On a side note regarding the PCBs, the site reads in part: > "Expose with UV through negative film, develop with Sodium Bicarbonate > desolved in water, and strip with liquid drano desolved in water." > > I am uninitiated in Negative film and usually use positive MGChemicals > boards. The way written, it is implied that the strip step takes place > bewteen develop and etch. Is this the case?
Sure, after the board is exposed, the developer hardens the film (under the unexposed area, I suppose). The remaining films needs to be stripped off before etching. In this case, Drano is recommended. I think but have not confirmed that it is NaOH in the Drano that is the stripping agent. tuck > > -Lares _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user