Kaolin, the best friend of a wet plater and his wife
This post will be more Tips&Tricks kind of content, but I’m already uploading new video, so although my audience are not only wet platers, please bear with me.
This tip is not the basics of wet plate collodion photography, it’s a tip that might save a month of your life and potentially a lot of money. It’s a technique that you do not need to use very often, but if you do need it, it’s your only friend, it’s an emergency exit. What do you usually do when your silver bath is contaminated and it fogs like English morning? You sun it, right? If that doesn’t work, you add baking soda and leave it for a long time to settle down, I prefer not to wait that long and I rather add baking soda so the pH is about 5-6pH and then I boil it, so 2/3 of water evaporates. Then I add water, filter it and sun it again for a day or two. Then I have perfectly pure silver bath with which is a joy to work.
Last week I’ve done all of the above, but after filtering silver bath still looked muddy. Strange, strange, very strange, I thought. What do you do when you see something like that? I know what you’re thinking and you are WRONG, you do not publish it immediately on FB with a caption: What’s that?!? NO, that it’s not how you do it! You go back and investigate what went wrong.
I cleaned the pot to see if the coating of the pot chipped off somewhere and UAU, it was a massive corrosion and the metal part of the pot was in contact with my silver bath. Do you know what metal is a developing agent in a wet plate collodion developer? It’s iron, a sulphate of iron! So that means the silver bath reacted with the pot and it contaminated throughly!
In this case, all the sun in the world will not help to clear the silver bath, so you need to call special forces, you need a bad-ass called Kaolin! It’s a fine powdered clay, that is used for china making. It is known to bind on itself all sorts of stuff, but in our case, it will clear the silver bath.
So I’ve added few spoons of Kaolin and the cleansing started immediately. After a minute it was much much better. I left it sunning for a day, so all the clay sedimented down and clear silver was ready for more wet plate photography. The contamination of the silver-nitrate with iron took a fat toll, but at least I saved the remaining silver. If I wouldn’t had kaolin, I would have to dispose it.
Talking about disposing silver-bath. Mark Osterman told me, that when he started with the wet plate collodion process in 90’s it was a habit that photographers were using silver bath until it got contaminated and then they disposed it and mixed it fresh! He have learned from ancient books about sunning, baking soda, boiling, kaolin and all this witchcraft that we do today. I can imagine that us wet platers hurts the thought that we would need to mix new silver-baths every month or so, but there is one nice method how they’ve disposed the silver bath. They used it for painting of wooden fences and apparently it offers fantastic protection! I also read in Osterman’s Collodion Journal that silver nitrate was popular for dying hair. Imagine how permanently black hair were! My hair is getting kind of gray, I might spare some silver nitrate🙂
Back to the topic. Kaolin can be used also to clean your silver bath during wintertimes, when there isn’t much available sun, I use it to cleanse my silver bath for albumen printing. The only way to get albumen out of your silver bath is, you guessed it correctly, Kaolin! I also used a table spoon of kaolin with some baking soda to help my digestion problems. Seriously, it really helps! This is pure classic medicine, it’s not alternative mambo jambo! But all the methods above are alternative usage of Kaolin. Today it’s mostly used in beauty saloons, for facial masks, since it also cleanses skin. So the bottom line is the same as the title:
Kaolin, the best friend of a wet plater and his wife!