Oil drying agent
painting implement
An oil drying agent, also known as siccative, is a coordination compound that accelerates (catalyzes) the hardening of drying oils, often as they are used in oil-based paints. This so-called drying (actually a chemical reaction that produces an organic plastic) occurs through free-radical chemical crosslinking of the oils. The catalysts promote this free-radical autoxidation of the oils with air.
Varieties of drying agents
Typical oil drying agents are derived from ions of cobalt, manganese, and iron, prepared from lipophilic carboxylic acids such as naphthenic acids, ethylhexanoates, and fatty acids. Formally, they are classified as metallic soaps. Often they are highly oil-soluble. Some are even viscous liquids.
Traditionally, drying agents contained lead, but due to lead's toxicity, cobalt and other elements, such as zirconium, zinc, calcium, and iron, have become more popular. Most driers are colorless but cobalt driers are a deep blue purple color and iron driers are reddish orange. These colored driers are therefore compatible only with certain darker pigmented paints where their color will be unseen.
Begin with the source’s own compact description: “Oil drying agent” is painting implement. The dossier treats that line as a proposition to test through drying, agent and painting, not as a finished interpretation.
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Reception evidence should be dated and situated: later canonical status may differ sharply from the work’s initial circulation. The source revision retrieved here is dated Aug 6, 2026. The linked authority identifier is Q649586. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Oil drying agent” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.