Re: Coating and bug light
s carl king (sanking@hubcap.clemson.edu)
Thu, 9 May 1996 09:48:15 -0400 (EDT)
> I used to use the yellow bug light for my alternative processes, because
> all the books reccommended it. After tests, I found that, at least for
> Pt/Pd, ordinary white incandescents are completely safe and do not fog
> the paper at all, in fact I have a 60 watt bulb in a reflector two feet
> above my coating table which remains on for the duration of my coating.
> There just doesn't seem to be enough UV in the excitable region to affect
> the paper.
>
> Now I don't know for sure, but I would expect the other UV sensitive
> alternate processes would react in a similar manner. A simple fogging
> test would determine this.
>
> Sure is easier to see the coating of a yellowish solution under white
> light rather than yellow.
>
> Anybody else?
>
> John
>
It is also perfectly safe to sensitize carbon tissue with an ordinary
incandescent light but it should not be dried under this
light. When I first got into carbon printing I started using a
bug light for the same reason
noted above (all the books recommended it). In my working conditions,
however, there are still reasons to use the bug light, in that I
sensitize and dry tissue in a room where others operatoins are
carried on simultaneously. I presume all of the above would also
apply to gum printing.
Sandy King