Hi all, looking for some opinions here which may help my problems
I'm using a 3' x 4' yellow 120 mesh (i think this is 305T in inches - in australlia = metric)
For light setup I'm using a high bay warehouse light - 400W metal halide (no UV filter cover)
The diagonal of my image = the light distance from the glass to the bulb (and I'm warming up the bulb before exposing)
I'm coating twice on each side with a scoop coater, always making sure to coat the ink side last. I am coating twice because I always end up with a thicker deposit of emulsion in the middle with one coat - two coats makes an even sheen, although it is thicker than I would prefer.
I'm drying stencil side down.
Now the problem comes in when it comes to washing out - halftone dots become quite fragile and wash out too easy. this would make me think that I've underexposed, but if I expose until the emulsion is a lot firmer I end up with too much light intrusion making the open areas smaller than they are and the positive.
Is this a common problem with using oiled paper positives? I have used the same setup with 2000W MH and dont get a problem at all.
2000w exposure time = 6 minutes
400w seems to be upward of 40 minutes...
Maybe having to expose for a longer period of time means I get more light encroaching around the positive?
I would use transparency but @ $350 for 4 prints (CMYK) i'd rather use the cheaper alternative!
Any suggestions here would be greatly appreciated!