ARTFEED — Contemporary Art Intelligence

Artist's Guide to Oil Painting Mediums: Fumed Silica and Chalk Additives

publication · 2026-03-29

In the second part of a guide for oil painters, the author discusses particle-based additives and preferred mediums. Fumed silica, derived from heat-processed sand, creates thixotropic properties for transparent glazes. Chalk dust, made from ground calcium, produces opaque, textured impastos. The author recommends pre-mixed products from Natural Pigments, including Oleogel for glazes and three chalk-based mediums for impastos. The guide also addresses common questions about mediums, including health considerations and techniques for different painting styles. The author promotes online video courses on techniques like glazing and scumbling.

Key facts

  • The guide covers particle-based additives like fumed silica and chalk for oil painting.
  • Fumed silica creates transparent glazes with thixotropic properties.
  • Chalk dust is used for opaque, textured impastos to build up paint layers.
  • Natural Pigments offers pre-mixed mediums such as Oleogel and chalk-based options.
  • The author addresses FAQs on mediums, including health risks from solvents and techniques for different painting methods.

Entities

Institutions

  • Natural Pigments

Sources