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I used Liquin extensively in the past and experienced no problems. My approach was to dip the brush quickly into the Liquin and then into the paint. The ratio was always fairly equal.
Now I have adapted a slow drying palette and spritz a little Clove Oil over the palette. This keeps the paints pliable for a long time and I usually need no additional medium.
Here is what I have gathered together about the different oils. The information has been gathered from different books I have read over time. I am hoping that members of the forum can add their experiences so Michele's list of "Paint Mediums" can contain both fast and slow drying mediums. Michele, hopefully this will help make the list of applicable fast drying mediums, easier to go through.
-Linseed Oil
-less oily then Poppyseed Oil
-good drying oil
-dries within a day
-use in equal proportion (medium vs paint) otherwise wrinkles can form when oil dries
-cold pressed is clearer and has less impurities and dries better than hot pressed
-will darken a bit over time
-Poppyseed Oil
- a fatter oil then Linseed Oil
-allow ca. 2 weeks for drying
-do not resume painting until layer has dried (will crack the surface)
-makes for brightest lights and blues
-darkens less than Linseed Oil
-Walnut Oil
-slow dry
-non yellowing
*I have used M. Graham with good results
-Oil Painting Medium II (Grumbacher)
-slow dry
-use sparingly
-Turpentine
-buy the purest turp available
-quick drying/will dilute pigments
-recommended for high key painting, because it will dull the surface
*used by Whistler and Gainsborough
-Petroleum Spirit
-three varieties quick, medium and slow dry
-recommended for high key painting, because it will dull the surface
-Copal Varnish used as a medium
-contains oil copal varnish, linseed oil and turp or petroleum spirit in equal amount.
-drying time not known
-Oliesse
Copal Varnish mixed with Durozierz Oil 4 parts and Rectified Oil of Spike or Turpentine 3 parts
-makes paint solid
-could not find anything about drying property
-nor ratio of use
*Oliesse is made by Duroziez of Paris
*used by Gerome
-Huille Grasse Blanche (now replaced by Siccative Haarlem)
-clear Poppyseed Oil treated with Siccative agents using base of lead and manganese
-has milky appearance
-could not find anything about drying property
-nor ratio of use
*used by Bougereau
-Siccatiff Haarlem
-makes glazes solid and can act a a final varnish with rectified turpentine
-drying time not known
-preserves tones, inhibits "sinking in", prevents cracking
-can be further diluted with oil or turpentine
-won't alter colors as is ages
-manufactured by Lefranc & Bourgeois
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