The strange brewing of substances for sticking wool to silk continues. I am trying to use the recipes from the De Kethan Treatise/Sloane manuscript 345 as those are specifically described as being used for printing fabrics. They are called "assays" in the manuscript which is encouraging as "assays: are a term otherwise used as a preparatory layer for gilding with leaf metal. It certainly sounds promising and like the sort of thing I should be using. It also has the advantage of being a later manuscript, dated to the late 15th century and therefore relatively close to the time period I am aiming for. The recipe I am planning to use is a combination of boiled linseed oil, amber and colophony. Colophony is also called Greek Pitch and is a resin. The most easily accessible source of it modernly is bow rosin. I played violin all the way through college. I can tell you that there are few things quite as sticky as this stuff. It can also be found in soaps, shoe waxes, and glues.
The recipe: ‘Substancie tmaken daer alle verue in dinet Recipe .j. lb. Lyn olijs ende sidet een vre ende dan nemt (fol 25r) .viij. loet bernsteen ghepuluert, ende doen dy yn een erden poot ende ghiten dar op lyn olij dy voer gesoden is dat dy wynsteyn bedowen ys myt den olij ende laten dat sy
I do have some other things going as other options though. I started some glovers size with leather scraps from the leather jerkin and ordered some Venetian turpentine. There was specific mention in the discussion of the 17th century flocked wall papers that the glue used for the flocking was ant-pest because it contained turpentine. I wondered about this a lot since turpentine is used for things like cleaning brushes and thinning paints and I wondered how that worked. Then I found Venetian turpentine. http://www.dickblick.com/products/sennelier-venice-turpentine/ It is a resin made from larch trees with the consistency of honey, a gluey sticky substance that was added to paint to create enamel like effects. Many of the linseed oil varnish mentioned in the various manuscripts from the 9th through the 16th century have boiled linseed combined with different resins. There's copal and incense and other evergreen saps. The Venetian turpentine is not only similar/exactly one of the resins used, it is easily obtainable from art suppliers (and not $144 per 30 ml.) Sounds like a winner to me. I'm not sure if the liquid resin will be any different than the colophony I'm trying, but figured a few options and trials were a good thing.
So grinding and straining and mixing continues as I prep to smear my silk with oil-- an action that seems totally wrong to me. Here's hoping it goes well.