As for me, I find if the coating is uneven, it will buckle. Are you coating your paper with newspaper under it on top of a piece of glass? Also, If there's excess, don't try to coat your paper with any left over emulsion. I push the puddle over the paper once then absorb the rest with a paper towel. Make sure the puddle is even across the glass rod. Capillary action should draw the emulsion across the rod evenly. I find bigger sheets of paper buckles more than small sheets.
You've got a near perfect rectangle in the middle of that paper where the emulsion didn't adhere. Do they all look like this? Because that's weird. Usually, coating problems from glass rods show up as long streaks. The shape of that makes me think there's something else going on. Perhaps there's something wrong with the paper, or the surface below the paper. Or it could be just a fluke. It's hard to say if it just happened once. But I have never experienced a problem while coating paper with a rod that looked anything like that.
Good luck with the glass. Brushes can use more emulsion. Pt is expensive. But I've used this brush with great success. The trick is to wet this brush and use a paper towel to soak up as much water out of it then pour the pre-measured emulsion on the paper then brush evenly and quickly. If gives a nice edge too.Just once. What little coating I’ve done had been with a brush but that wastes too much emulsion. This was on a piece of newspaper on a work surface. I will try a piece of glass, less liquid and fewer passes. Thanks.
Good luck with the glass. Brushes can use more emulsion. Pt is expensive. But I've used this brush with great success. The trick is to wet this brush and use a paper towel to soak up as much water out of it then pour the pre-measured emulsion on the paper then brush evenly and quickly. If gives a nice edge too.
https://www.jerrysartarama.com/rich...OuhSv649yoCWkhOLyFVKLn0hurDpM3ooaAkdLEALw_wcB
I coat paper on glass. I only use heavy weight paper such as Hahnemuhle PR as they lay nice and flat. I use a bit more sensitiser than needed. I always make four passes, then Q-tip up the excess. I find if I skimp on solution, I run into issues. You're making Pt/Pd, so you certainly don't want to have too much excess...unless you're filthy rich. My experience is with kallitypes, and cyanotypes, so not too concerned about the excess... (thank God carbon transfer is so cheap!)
What paper are you using? Maybe you should practice with something cheap and easy like cyanotypes...
You're right in practicing on cheaper processes like cyanotypes. I just starting to experimenting with Kalitypes because it's so much cheaper. There are more steps involved as you know. But from what I've heard and seen, a good Kalitype is indistinguishable from a planotype.I coat paper on glass. I only use heavy weight paper such as Hahnemuhle PR as they lay nice and flat. I use a bit more sensitiser than needed. I always make four passes, then Q-tip up the excess. I find if I skimp on solution, I run into issues. You're making Pt/Pd, so you certainly don't want to have too much excess...unless you're filthy rich. My experience is with kallitypes, and cyanotypes, so not too concerned about the excess... (thank God carbon transfer is so cheap!)
What paper are you using? Maybe you should practice with something cheap and easy like cyanotypes...
Ha, definitely not filthy rich. The cost is one of the things that makes it difficult to experiment too much! I'm using some old Arches Platine, might get some new paper to test out. Thanks.
Good luck with the glass. Brushes can use more emulsion. Pt is expensive. But I've used this brush with great success. The trick is to wet this brush and use a paper towel to soak up as much water out of it then pour the pre-measured emulsion on the paper then brush evenly and quickly. If gives a nice edge too.
https://www.jerrysartarama.com/rich...OuhSv649yoCWkhOLyFVKLn0hurDpM3ooaAkdLEALw_wcB
Economy for me is especially important with process that use platinum and palladium. I find there's not a huge difference also. I also prewet my Richeson 9010 brush then I use a folded paper towel to dry as much water off the brush making a sharp edge. The edge of a brush is more like a squeegee pushing the emulsion on the paper like a glass rod.I do the same and find this a lot easier than the glass rod. I have a brush for each process, so no cross contamination. When the brush is pre-wetted it seems not much worse than a glass rod economy-wise.
Thanks for all the comments and suggestions about coating. I think some kind of synthetic brush might be a good shout to try.
I did find out what caused the issue I described in the initial post. I use a shallow print box (as it's the only one I have big enough) to store the paper whilst it's drying. With the curl induced by coating it touched the underside of the lid thus losing emulsion... Nothing wrong with my coating, nothing wrong with the paper. Just dumb stupid user error...
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