That looks fantastic, Michael! Nice to see the technique I sent you works so well. I'll attach the same pics I sent you here. They'll be going on The Light Farm in a new article on coating as soon as I can type with more than one finger (carpal tunnel surgery).
It's the same system as here: http://www.thelightfarm.com/Map/DryP...latePart4a.htm, without the use of the well. Emulsion poured in the center of the plate spreads out over the edges evenly, and is stopped by the 'emulsion dams'.
It works perfectly. I line up a dozen plates and pour all of them in about a minute. I've never tried it with Liquid Emulsion, so I'm absolutely delighted to see it works with a commercial emulsion, too. Knowing Michael, I imagine he added his own twists .
Very nice result.
One of my glass plates is shown in the video here on APUG. Best wishes to you both.
My method is similar but does not require the dams. The coater itself acts as a dam.
A well coater with a built-in blade, or a trailing glass rod, needs to have a starting point off the plate because the leading edge gets more emulsion laid down (unless, of course, I'm visualizing your coater incorrectly, Ron.)
The nice thing about the 'dam surround' system is that it is totally adaptable to any size plate. You don't need a special size coater for each format. Flexible during a given coating session. too. Last time I coated four 4x5's and six WP -- just had to jigger the dams a bit. Coating all of them still took about a minute (set-up maybe five minutes.) The plates don't have to be pre-heated and if you've got the right emulsion temp, the emulsion flows over the edges of the plate and stops at the dams, giving you a perfect and even coating thickness. Nicest thing of all is it's cheap! The dams are re-useable.
ok, spouse being very firm that I MUST stop typing .
Ummm, I had not meant to criticize your method Denise, but the fact is that only one blade is needed - for the largest size width you wish to coat. And, you need not lose any plate due to more emulsion being laid down. There is simply one small notch at the edge from the tape holding it down.
So, yes, you are visualizing it incorrectly. I'm surprised, as I showed the method at the workshop you took!
Basically, my desire is not to start a debate but to merely point out that there are many ways to do this such as the wire wrapped rod (which is very inexpensive, but a tad messy and wasteful of emulsion). It too needs dams. There is also the original method involving pouring in which plates were poured up to rather large sizes with low mess and low waste. This is an acquired skill that takes a LOT of practice with gelatin blank plates.
Lets not get involved in this back and forth. Just agree that we can do it many ways and with varying amounts of mess and waste.
I wish you the best in your recovery.
No worries, Ron. It never occurred to me that you were criticizing, or starting a debate. It felt like a conversation about coating methods. You, of all people, know that I embrace diversity of ideas and workflow strategies. I hope others are interested in joining the conversation, especially the Liquid Light folks. They have a lot of experience with getting emulsions down. Newbies to emulsions, tuning in for the first time, will probably be interested. I know I'm looking forward to hearing a description of how Michael adapted the emulsion dam method to make it his own with such phenomenal results.
No "back and forth', no debate, just an open, friendly conversation among emulsion enthusiasts, with no one feeling like they have to have the last word.
(And: we didn't get around to coating plates in your first workshop.)
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the well method
There are so many ways to coat plates it was very confusing at first.
My way was to use glass of different thicknesses. Single strength glass is the photographic plate; it has smoothed edges. Surrounding it are double strength glass edge strips to contain the gelatin, like a dam, thanks D, and to raise the bar that scrapes the emulsion all over. I practiced with buttermilk to measure how much emulsion to use. That much was put into a heated nose pot, and dumped it out near the leading narrow edge of the glass inside. If emulsion hadn't already filled the narrow edge, I pushed it up and over then back all the way across using a puddle pusher; another polished edge piece would do the same thing.
This was all done on a sheet of rubber matt. Excess is required and then scooped up to be used again; an artist's palette knife is used. Too much left over is better than not having enough and running out.
Emulsion was 110 degrees F. Hotter than 120 and it forms swirls of silver on the surface. Nothing was added to the emulsion. The plates were not heated. The scraper was heated, that may have helped, but not if it is wet.
Liquid Light emulsion is very sticky and gets stringy. It needs to be cut carefully or the emulsion will pull off the plate as it stretches. I think I'll use a long wide cutter like a dry wall knife next time to remove the edge strips, instead of a razor blade, the edge could be sharpened instead of square...
Now I have yet another way to pour plates I tried that Ron told me about. Photo Flow was added to a canister of emulsion and hand poured onto 4x5 plates. One 35mm film canister is about an ounce; four drops of Photo Flow were added. 110 F was the temp and glass was hand held. I was able to pour 5 plates with some left over. Hitherto only 2 plates were possible without the addition of the new juice. Liquid Light was the emulsion. The new method produces thinner emulsion layers that fix in less than 5 min instead of up to 20 with a thicker layer.
Plates were left out in the open air; a dehumidifier had been added to the room; and a drape over the door blocked out the light so I could get out. In 4 hours the plates looked fully dry. They were put into the drying cabinet for the night and were shot and processed the next day. Wow.
The coating was uneven with these thin hand poured Photo Flow emulsions, but fast and easy. If I had heated my overhanging stone and allowed them to sit there for a minuet before pushing them onto the cold end of the stone the emulsion would have leveled out better than just holding it and looking at it before putting it onto the cold stone.
Bernie at Bernie's Camera Center, the only camera store left in W PA, wants to see one of my ULF plates. I had to purchase a set of 16x20 trays and some chemicals. He got me some 12x15 Ilford negative film, iso 125, and I'll take the plate over in a plate holder with some white paper behind it to show him when I pick up the film.
As far as I am concerned, the sooner all the details of how to coat plates are fully documented, the sooner more people will begin to use dry plate cameras again. They may then make their own emulsions. I may do that soon, too.
Last edited by studiocarter; 07-03-2011 at 09:45 AM. Click to view previous post history.
As you and as I have said, there are many ways to coat plates. At the time Denise took my workshop, I had the blade, but we did not have plate holders or plates at the Formulary. Now they do have both. With the blade I had, I demonstrated how a plate was coated with it, but we were forced to coat only film.
For the workshop at GEH, I promise to have both blades and plates for demonstration of the method. I hope you can attend. The methodology will be documented in photos in the book. Mark Osterman, a world expert in plate coating will be teaching alongside me and he can also demonstrate pouring plates.
As for camera shops, I used to haunt Triangle Camera in downtown, but mainly Cadet Photo on 6th in Pittsburgh near the Dome Arena. I also was a regular at Brenner Photo Supply. Alas they are all gone now.
Nice write-up, Michael! I love the innovation of making the dam bars just a wee thicker. I've been coating regular thickness glass and using the same thickness for my bars, but right before my summer 'vacation' I snapped a bunch of extra thin plates to use with a new-to-me half plate camera with book style holders that only take thin glass. Now I'll use my regular bars when I pour them. Thanks!
With your permission, I'll include your idea in my coating article -- with kudos to you, of course .
Ron, Have you found someone to make your blades? I hope so. They'd be a natural pairing with your book and DVD. (But I'm a bit dim, I'm afraid. I still don't see coating a 4x5 plate with an 8x10 blade. Can you post an illustration from your book? It would be a great sales teaser!
Think "shim". It works.
As for blades, I may have found a new source, but the cost is still exorbitant. But, that is what you pay for Stainless Steel and precision milling.
Thanks DW, sure go ahead. I just made another 8x15 only thicker this time. It didn't quite cover the first draw and I had to push it back and forth. Lucky it was still hot and it worked fine. It took a full 3 ounces with little left over.