|Bolognese MS De Tintis ad Tigendum Pellum (Merrifield 426)|
2016 Vinegar and buckthorn: On September 24, 2016 I tried with Organic Spectrum brand white wine vinegar (diluted to 6% acidity by the manufacturer). Heating in my corning ware experiment sauce pan caused the vinegar to simmer, steam and evaporate. It was so strong I had to leave the area repeatedly to let it reduce to half.
|bubbling and steaming buckthorn and organic white wine vinegar for Merrifield 426 experiment|
|buckthorn berries boiled in wine vinegar, ready to squeeze out juice (Merrifield 326)|
Neither 'strong' vinegars yielded green with buckthorn berries for me.
It now occurs to me that maybe I'm taking the buckthorn and vinegar recipe out of context...? The recipe before this, 101., and the recipe after it, 103., incorporate verdigris with vinegar and other reagents. (Verdigris in many medieval treatises created frequently by fuming copper with vinegar or ammonia.) Perhaps it's mistakenly omitted?
Or did everyone just know to always add rock alum to buckthorn to produce green? Vinegar or not that seems to work...
The paint results of these vinegars with buckthorn berries and also with the modification of added alum (potassium aluminum sulfate) can be seen here.
Later in the same book it talks about using vinegar with buckthorn to dye skins green but putting either of these resulting liquids on leather doesn't seem to produce green either. Someday I'll get to take pictures of those results and put them here. Promise! ;)
|Bolognese Manuscript De Tintis ad Tingendum Pellem (Merrifield 558)|