fol. 4v

How you shall temper all colors and grind them §

Blue you shall not grind, unless it is rather coarse. If it is coarse, grind it on a grindstone, which should be really smooth, or on a glass pane or a slab of marble. Then take the blue and lay it into pure lye, overnight or an hour or two, and grind it then on a stone without the lye with egg yolk. Then rinse it really well with lye or with white wine or with pure water, and let it then dry on a paper or in some dry dish. When you have rinsed it clean and fine and dried it, then take pure gum arabic water and temper it therewith, that it may flow easily from the pen. The gum water should be pure. so that it is neither too thick nor too thin and neither too strong nor too weak. so that it should be right and also not too light. The blue should be tempered, so that it flows easily from the pen and from the brush; and if it does not want to flow, take a little sugar-candy, that makes it flow easily from the brush.

Aurum musicum, you shall not grind it hard, you shall grind it with pure well water, and then you shall temper it with pure gum, like the blue, without the sugar. But you shall rinse it with pure well water and then temper it, as it is written above, not too strong and also not too weak. § / Nota. Dark brown or dark red

The dark brown or dark red make thus: Take half an ounce of brazilwood, grated or beaten, and put it into a stone jar. that the brazilwood fills half the jar; and then take strong lye and warm it, that it is lukewarm, and pour the lye over the brazilwood, the width of a finger, and stir it well; and take


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Source: Hellmut Lehmann-Haupt, The Göttingen Model Book. Columbia 2nd ed. 1978