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Copal Painting Medium Our unique Copal Painting Medium comes in an easy-to-use bottle with a supplied twist-to-open dripper-cap


Our Authentic 19th Century Copal Painting Medium Be aware, this is not an alkyd-based "Copal" medium. There's no alkyd in it! Nearly every so-called "copal painting medium" being marketed to artists today is not based on actual copal varnish. Nor do any of these imitations perform like the original copal medium so favored by the great painters of the 19th Century. True copal varnish does not behave like alkyd varnish. Ttrue copal varnish noticeably congeals normal commercially-made or studio-made oil paints. This congealing property also applies to the painting medium conjured through use of that true copal varnish. Again, alkyd varnish does not have that congealing effect. Both of our 19th Century Copal Varnishes offer this congealing attribute; and so either can be used to make this treasured painting medium.

How we make our Copal Painting Medium

The recipe is not 'set in stone' but, again, this is the classic formula used by so many 19th C. masters. 1-part of our own 19th Century regular or Drying Copal Varnish is first combined with an equal part of turpentine spirit, the whole is then shaken for incorporation. After combining the spirts with the varnish then the oil can be added in.-- do not add the oil without first adding the spirits! Shake well and the medium is done. If you have a bottle with a drip-cap then that will make the medium very handy for use. The use of the Drying version of our copal varnish results in the paint being dry and ready for further layers on the morrow. We offer this Copal Painting Medium in either the fast-drying version or the slow-drying (which allows the paint to be applied over two-three days).This effect of adding this copal medium to oil paint closely resembles adding meguilp or other "jelly medium" to the oil paint. The engendered surface is quite like the 'clever' brushwork produced by masters such asAlbert Bierstadt, or Jasper Cropsey, or Thomas Moran.

Copal Painting Medium can also be made rather easily in the studio. Again, the classic formula requires the following three basic ingredients:

(1) One part of our 19th Century Copal Varnishes--If a fast-drying (overnight) medium is desired, choose the 19th Century Drying Copal Varnish, which has been cooked with a drier added.

(2) One part of a solvent, such as Gum Spirits of Turpentine or D-Limonene. The use of mineral spirits (common "paint thinner") may not work, though it can be used to thin-down the treated oil paint.

(3) One part of some preferred painting oil, such as linseed or walnut. (Bierstadt used poppy oil)


Using the medium

In typical practice, the dry pigments are stiffly rubbed-up with a normal painting oil; then given a few drops of the Copal Painting Medium. The copal medium is mixed well with the paint, causing the paint to soften but remain thixotropic, meaning the paint still captures and retains the stroke of the brush. There is no slumping or leveling as one might expect with the use of regular oil (especially standoil) or the typical modern-day alkyd painting medium. The treated oil paint is soft and facile in application, yet it retains the impression of the brush-hairs where desired. Where desired, the surface can be smoothed via brushing-over. This effect of retention allows the oil painter to construct and cover the work with a masterful surface, whereby the paint can be made to imitate the physical structure of the objects portrayed, no matter if the object is smooth or textured --however the brush or knife leaves the surface then that is how it will remain through the curing; and with no induced wrinkling.


The following image shows the soft but upstanding paint created by dosing handmade oil paint with a few drops of Copal Painting Medium:




During a painting session, the turpentine will slowly evaporate from the applied paint, which allows easy "build" -- the application of additional paint-superimposed atop the initial paint. For lines and such things as tree-branches, the brush is dipped in solvent then stropped into the treated paint to thin that for application. Further instructions for use are included with the medium. Caution: This copal-based medium in its bottle may be thinned with additional turps, spike oil and D-limonene, but not mineral spirits (MS). If use of MS is desired, simply add the Copal Painting Medium to the paint first; then the treated paint can be diluted with MS.

Ordering Online

This product should not be used by those who have a problem with breathing or other exposure of solvents!


Order this Copal Painting Medium 65 mil. bottle is $16.50

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For further information or to place an order, please use our onlne shopping page or call (301)689-3389 8:30 am-4 pm EST Tuesday through Saturday. Shipping costs are calculated according to number of items ordered. We ship only by USPS Domestic and International Shipping. There are some world countries (such as Nigeria) we cannot ship to. If in doubt, please call or email us (wmg@jamescgroves.com) before ordering.

Or send your own ordered items list with personal check/money order to:

Western Maryland Gallery
11425 Upper George's Creek Road SW
Frostburg, MD 21532


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