Hello,
Do you know if there’s any research on bismuth white reactivity with drying oil?
I gain information that bismuth white is on the list of reactive pigments. I wonder if it has positive effect similar to lead white, or negative like zinc oxide. If it’s positive the leek of toxicity makes it a candidate to use as filler i.e, ageing agent to oil paint.
Kind regards,
Damir P.
I do not know. I will ask a few other moderators.
It is essential to distinguish which bismuth white you are interested in. There are two forms of bismuth white—bismuth oxychloride and bismuth nitrate—both chemical substances that are knoan as bismuth white pigments. There is sparse information about the reactivity of either bismuth white, but one study of basic bismuth nitrate (OB1NO3.H2O) noted that its reactivity was very sight in linseed oil.
Bismuth nitrate tends to recrystallize, leading to loss of pearlescence, and has not found significant application in paint.
Of greater concern is the photo-induced discoloration of bismuth oxychloride. Bismuth (III) is reduced to Bi by the action of light, resulting in severe darkening. The first generation of pearlescent bismuth oxychloride with improved light stability was released in the early 1990s. The stabilization is due to a cerium hydroxide post treatment.
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