Hello
Black oil by Natural pigments is made from linseed oil and litharge (lead oxide): https://www.naturalpigments.com/dark-drying-oil-black-oil.html
Recently I found out, that Holbein also offers Black oil, however according to description, this one is made from linseed oil and lead white (translated website): https://holbein–shop-com.translate.goog/?pid=147464018&_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=sk&_x_tr_pto=wapp
Can you estimate, how the different form of lead (i.e. lead white instead of lead oxide) affects properties and behavior of black oil?
Ivan
First, please read through #22 in ourMyths, FAQs, and Common Misconceptions section of our resources section concerning leaded oils.
As to the difference between leaded oils made with litharge vs lead carbonate. I know of no studies on this, but they were probably done by the paint industry in the past. As powders ground into oil, litharge promotes drying at a far faster rate than lead white. In fact, lead white is not a particularly fast drier in linseed oil. It dries well and makes a great film, but it is not faster in drying than many other pigments.
I do not know if this discrepancy is conferred to leaded oils made from them or not. Perhaps George from Natural Pigments can comment on this.
There have been various recipes for preparing leaded drying oils through the centuries, such a heating oil with lead white, litharge (lead monoxide), sugar of lead (lead acetate), metallic lead, lead hydroxide, etc. I have not encountered many papers describing studies of the differences between these lead compounds as driers in oils. One study, however, found that whereas lead white does have a drying effect on oil, its effect is much less than that of litharge, and is the reason this compound appears more often in recipes for drying oils.
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