Williamsburg Extender Medium


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Williamsburg Extender Medium

Williamsburg Extender Medium is an oil medium made of marble dust and barium sulfate in linseed oil. This Semi-transparent medium is used to extend oil paint without altering its consistency. Add to a maximum ratio of 1:1 Extender to paint. Will increase the tendency to yellow. Use this medium as an additive only, not on it’s own.


  • Semi-Transparent
  • Moderate Drier
  • Max Ratio: 1:1
  • Use as an additive only


  • Tube: 150 ml (5 oz)
  • Tin: 473 ml (16 oz)

Williamsburg Handmade Oils are known for their high quality, as well as their extensive palette of colors, including genuine Italian Earth Colors. Since joining the Golden Artist Colors family, the color palette has expanded to include French Earth Colors and a range of colors made from Safflower Oil.

Originating from the Williamsburg neighborhood of Brooklyn, Williamsburg now makes over 170 artist quality oil colors, as well as oil mediums and grounds in New Berlin, New York.

SDS Safety Data for Oil Mediums

The Williamsburg Philosophy

Getting the proper pigment is just the beginning. So much of the quality of an oil paint is in the grinding of the pigment. Williamsburg grinds each pigment to enhance the beauty and luminosity specific to that particular pigment. Some colors will feel slightly gritty, while others are extremely smooth. For example, Williamsburg Cerulean Blue has a beautiful, velvety, light absorbing surface with an extremely strong covering power. Conversely, Sienna colors are often gritty in order to allow light to travel through the vehicle. This exposes rich golden or mahogany undertones rather than just dull, heavy browns.

Artist grade pigments are ground in pure, premium, alkali-refined linseed oil and are made in small batches no larger than eight gallons at a time. This allows for total control over the product, much like the late nineteenth century French color makers. All the materials are hand measured, and every ounce of paint is scrutinized for quality.

Williamsburg offers technical advice to museums, and conservators, as well as artists all over the world and welcomes your questions and comments.

Williamsburg Handmade Oils Product Support.

Additional information

Size ml

150 ml, 473ml

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