Lead White Update | The digestion & whitening of Saturn
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- Опубликовано: 3 ноя 2019
- This is a little update on the changes that have been occurring with the sigil of Saturn I cast some time back.
Part 1: • Lead White: Part 1 | C...
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This is a re-upload as the last one had some footage missing.
This is brilliant!
Well done for persevering :)
I've been wanting to make flake white for a while but I wasn't sure about the exact process. I knew that the old method was to mix up some yeast, sugar. water and put it in a closed container. But from what you said I need to make lead acetate first before trying to make lead carbonate?
The vapours from the acetic acid will attack the lead and make lead acetate which is turned to a basic lead carbonate by CO2. There is a wet method as well but it's a little complicated.
I can tell you from a decent amount of experience that making lead white using these modified stack processes is far easier than you would ever guess. I personally use lead sheet coils stored in a cooler with a layer of acetic acid poured directly on the bottom (i use about a 15% acetic acid/ vinegar concentration). The lead coils are suspended above the acid by using a few low glass jars which are also filled with the acid, with lead strips laid flat between the jars and the coils placed on top of these flat strips.
The biggest change I made was installing a quick connect hose fitting to the outside of the cooler, and creating a basic CO2 generator (in the form of the classic baking soda and vinegar reaction). With this, I've been able to achieve almost 10 pounds of stack lead white in a ridiculously short 3 weeks (though I was really, REALLY pushing the reaction hard, and this can be tricky).
I also use a heating mat directly under the cooler, and I try to maintain a temp somewhere in the mid to low 90 degree range (F not C).
Once you decide you want to process your lead white, I strongly suggest purchasing a decent protective mask, and keeping the lead coils moist until you wash them in warm water (to keep dust from forming and thus inhalling it).
You're going to need to wash it repeatedly unless you like acetate in the lead white, which creates a different rheology, mulls out to a very stiff paint at first, and obviously dries faster. You'll get very good a being able to determine at a glance how clean the lead white is.
Finally, you need to deal with the lead acetate washings, and there will be a significant amount of it. I personally boil off the water, and the I either allow the acetate to crystalize for other uses, OR I just add some of that good old baking soda to the lead acetate solution, and precipitate out some more lead carbonate! Now, this lead white is far more like industrial lead white, and I call it SHITE WHITE, but it's perfect for covering canvases and so on. You can increase the quality of this lead white by adding a small amount of litharge (lead oxide) while you are boiling a solution of lead acetate in water. The litharge will dissolve with some stirring. If I remember correctly this changes the lead acetate from the neutral to basic lead acetate, thus forming basic lead carbonate upon the addition of baking soda, etc.
Hope this helps.
Thanks for the video, but I can't process how to is contact the lead and acetic acid, using?
Ah there was a small bowl of acetic acid in the glass jar and the vapours from the acid reacted with the surface of the lead. In Part 1 of this project I think I show that process.
I made a good experience with slightly heated vinegar in a separate glass in the bucket with a lid. I have several glasses in the bucket, with lead metal sheets rolled as in the stack lead white process, with slightly heated vinegar and with a mixture of sugar, flour, water, and fresh yeast. There is quite a humid sour smelling (fermenting) and acid smelling atmosphere in the translucent bucket. Although humid, the lead oxide - acetate - carbonate seems to be quite dry. The solution and the vinegar need however replacement after 10 days. In the meantime, under current conditions, I scrape off the white salt from the lead rolls and put it for washing and sun bleaching in closed glasses and replace the water regularly with sometimes stirring the sunk salt. I read in the De Mayerne manuscript, that white lead is ok with water, important, as some pigments seem to not work well with water and some are ok with water. From Luis Borrero, who shares great painting technique videos on youtube, I learned that the lead white pigment is ground with water and later oil is added to the wet lead white pigment until the white gets into the oil and the water evaporates. I am however not yet far enough to the grinding and oiling of the pigment. I was inspired by this video ruclips.net/video/Ls4c8suQxac/видео.html and learned also a lot from this one ruclips.net/video/9jAFwCA9zB0/видео.html&t I hope this might inspire you as well. Best
Jeremy, how is it going with the Lead White project? Good luck with yours. Best wishes, Die Himmelsscheibe
I have not had time or space to resume this project sadly.