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Old 09-12-2017, 02:39 PM
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Walnut Oil -- Linseed Oil

I use a Linseed based Oil Paint and have begun using Walnut Oil as my Medium. I haven't noticed any problems but am wondering if mixing Linseed with Walnut is something I should avoid.

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Old 09-13-2017, 08:18 PM
contumacious contumacious is offline
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Re: Walnut Oil -- Linseed Oil

Just curious whether you mean mixing the two oils together in a medium or painting with walnut oil as a medium on top of passages that were done with linseed oil?

Also are you using straight walnut oil as your medium, or is it mixed with something else?

My initial reaction is that you should be fine since Walnut Oil is fatter (slower drying) than Linseed, but it might not be a good idea. I have read that it is better to use the same medium through the entire painting. That being said, I have used paint with walnut alkyd medium over linseed oil only layers with zero problems.

I am assuming that you know that straight walnut oil mixed with the slower drying colors can take many weeks to just skim over, let alone actually dry. You may want to add a bit of walnut alkyd to the pure walnut oil, or even a bit of linseed oil to speed up the drying.

You might want to post this in the oils / technical area also to get a larger viewing audience.

http://www.wetcanvas.com/forums/forumdisplay.php?f=491

Last edited by contumacious : 09-13-2017 at 08:28 PM.
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Old 09-14-2017, 05:11 PM
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Re: Walnut Oil -- Linseed Oil

I mix Walnut Oil and Linseed Oil routinely. I use paints that are ground in Walnut Oil, and also some that have a Linseed Oil binder, mixing them together.

In addition to that, I make a glazing medium that includes both Linseed Oil, AND Walnut Oil, choosing each for their specific characteristics.

Mixing Linseed Oil, and Walnut Oil together is perfectly appropriate, and they are both compatible with each other. And much more compatible than some ingredients that are often recommended to be mixed together.
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Old 09-18-2017, 04:10 PM
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Re: Walnut Oil -- Linseed Oil

Thanks Contumacious and Mr Martin.

I had been following Carole Marine's Medium recipe:
1 part Stand Oil
1 part Gamsol
2 parts Refined Linseed Oil
but recently I saw a Richard Robinson video where he used straight Walnut Oil .... but he was using Walnut Oil based paint.
I like the idea of "no mixing" but wanted to make sure that I could use a Walnut Oil medium with my Linseed Oil based paint.
Thanks
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Old 10-03-2017, 02:25 PM
contumacious contumacious is offline
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Re: Walnut Oil -- Linseed Oil

I have been using plain walnut oil with several brands of oil paints, including some Alkyds. No problems noticed. Significantly slower drying times of course.

If I want a mixture to stay open for a longer period on the canvas or palette, from several weeks to more than a month with some colors, the walnut oil does the trick without the need for anything else. If for whatever reason I want to speed up the drying a bit of a mixture that already has walnut oil added, a bit of alkyd or a drop of Eco-House CoZiCa drier, 2% or less,will make that happen.

I recently did a drying test of a gel medium made with pure Walnut Oil plus fumed silica (no pigment) with and without a drier added. With 2% CoZiCa added, it started to skin over after about 30 hours. After 72 hours the thick impasto areas were well skinned over.

The test sample done with just the Walnut Oil and the Fumed Silica still had not dried much, over a month later. At almost 2 months it is still very soft with some wet areas.

Grumbacher Cobalt Drier worked a bit faster than the CoZiCa. Alkyds didn't work well at all because they caused the gel medium to become self leveling which was just the opposite of what was wanted. No amount of fumed silica added to the Alkyd Mediums I tested would make a nice stroke holding gel that was still brushable.

Mixing in some Gamblin Raw Umber about 1:1 to the gel medium with the CoZiCa added dried very closely to the same time as just the gel. Gamblin Alizarin Crimson lagged about 30 hours behind the Raw Umber. (Portions of this post were also posted in Oils / Technical)

Last edited by contumacious : 10-03-2017 at 02:39 PM.
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Old 10-15-2017, 10:50 AM
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Re: Walnut Oil -- Linseed Oil

Thanks Contumacious... I'm sorry I bought the Walnut Oil. It's far too slow drying for my tastes. I hate wasting a full bottle of Walnut oil so I might try mixing it with a walnut alkyd which, as you said, will speed up the drying time!!!
Thanks
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