Siccatif de Courtrai May 1, 2021 13:33
I mentioned Siccatif de Courtrai a couple days ago as a 19th-century paint drier containing lead and manganese that I'd bought some time ago and decided to actually try using. I hadn't used it before because I had been spooked by lead and really, I'd found that by using walnut oil and keeping 5 or more paintings in rotation, I always had something dry I could work on and didn't really need it. I had a separate studio then and so I had plenty of room for paintings drying.
But now I don't have a separate studio and have way less space for drying paintings, though I am utilizing the space above my T5 plant lights, which get warm but not hot. Still, I felt like it was a good time to check out the various driers I have. I decided to try Siccatif de Courtrai first, not least of all because only one drop was necessary per paint glob. I thought I could deal with that much lead and manganese.
This stuff is supposed to be problematic on linseed oil, causing it to wrinkle, but it is said to work well on paint using walnut or poppyseed oil. Although I had plenty of paints made with linseed oil, I typically have used walnut oil in a solvent-free painting method. I've used poppyseed oil mostly as a finish and a sun-dried version at that.
But the first painting I tried the siccative with, I decided to try painting with regular, NOT sun-dried poppyseed oil, since I have a bunch from a while ago. Although the siccative is supposed to render a relatively thin layer of paint dry in 8-12 hours, that was not the case with the paints to which I added poppyseed oil. In fact, the paint was still wet two days later. Disappointing. I should say I did NOT put a layer of poppyseed oil with siccative to start the painting. I think this might have made a difference.
Yesterday morning, I decided to try it with a painting where I used walnut oil as the medium. This is not any special walnut oil, not heat-treated or sun-thickened but just out of the bottle from Spectrum (although I also have a gallon jug from Jedwards, although you can get a sun-thickened walnut oil from Kremer). I started with a layer of oil+siccative that I applied and wiped off and then painted into, then added one drop to each paint glob on the palette plus the walnut oil, maybe five drops, which is about as much oil as I usually use.
Amazingly, by the end of the day, the thin parts of the painting were actually dry, and this morning, the whole painting is entirely dry. This is faster than the walnut alkyd I was using, which gives me a headache. This stuff doesn't give me a headache, although it has something of a smell. I'm thinking it has turpentine in it.
The Siccatif de Courtrai I'm using is by James Groves and contains lead and manganese. He makes all sorts of other interesting stuff, some of which I have, like Gentileschi amber medium and the drying walnut heat-bodied oil (which he no longer makes). I will no doubt end up trying these and other of his products, since this siccative has been so successful.
Other companies also make this siccative, but they mostly seem not to include lead and manganese. For instance, I noticed that the version by LeFranc & Bourgeois comes up first in search results, but their "white siccatif de courtrai" doesn't contain manganese, from what I can see, and their newer version of it doesn't contain lead either but instead uses zirconium and calcium. Their brown siccatif de courtrai is/was supposed to contain lead and manganese, but I have not seen it for sale. Sennelier also makes a version, but without either lead nor manganese. In fact, from what I can see, a number of companies make a version of siccatif de courtrai that contain zirconium and calcium instead of lead and manganese. So, not at all the same thing as what I used, despite the name.
I saw one remark out there that said that this size bottle of siccative would be used up in one underpainting, but all I can say is that the canvas in such a case would be the size of a barn. This is for using at one drop per nut of paint. I think it's going to last me a while, and when I use it up, I should be able to get another bottle for twenty bucks, which is reasonable, IMO.
I'm going to slowly push the envelope with this siccative in terms of paint thickness, since I do like to have a certain blobby quality in some paintings. It would be great if this stuff shortened the drying time for that.