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Differences between black oilsApproveRejectUn-ApproveSubscribeUn-Unsubscribe

Question asked 2023-02-07 07:03:40 ... Most recent comment 2023-02-10 18:28:23
Drying Oils

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

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Moderator Answer (brian baade)

[2023-02-08 11:00:00]

First, please read through #22 in our Myths, 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.

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Moderator Answer (george o'hanlon)

[2023-02-10 18:28:23]

​​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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