What do you mean “invisible layers”? Such invisible Medium must have a refractive index 1 which is vacuum or air refractive index.
Most of translucent materials like glass, solvents or polymers have a refractive index from 1,3 to 1,8 and because of it are visible. You can use picture varnish or alkyd varnish or even translucent epoxy resin to make a translucent layer but you can`t reach invisibility in it.

Anyone know what medium to use to create layers of translucency in oil painting. I am trying to create an effect of deep invisible layers.

Do a search here at WC for “glaze medium” or “glazing medium” or couch medium / couch. But they are not invisible, really.:)

With acrylics and some mediums thrown in. If you add molding paste you can make those slime toys kids play with. I wish I had some fluorescent paint, it’s pretty expensive though.

Beautiful painting, Gigalot!

Salvador Dali in his book “Diary of a Genius” said he has a terrific troubles when paint layers lost its brilliancy after drying. After a few experiments I prefer to paint a very thin “watercolor looking” glaze layer as thick layers are unstable.

Surely this is manageable with some of the techniques that have been discussed over in the Oil Painting forum – oiling out for layers, then using a glossy final varnish over all? I’ve also recently begun adding more linseed oil to my paint, particularly white, and it does make a noticeable difference in the appearance of the dried paint.

Theresa, I think I know the look you’re talking about. I’d go with pigments that are more transparent in oil – or alternating transparent with more opaque layers – perhaps with extra linseed oil added to the paint to improve gloss and increase transparency, followed by that glossy resin final varnish.

Thank you, llawrence!

It is safe to paint acrylic over oil paint but only after complete drying of oil paint layer. It can take a few month or 1 year depends of thickness and paint properties.

I honestly don’t think oils should be used for this. Yes oils can be used transparently to great effect, but it sounds like we are talking about glassy transparent layers of a appreciable thickness here. Rather than putting acrylics over oils, I would go with acrylics all the way. Pure acrylic medium, when dry, appears quite clear and transparent in my experience. I have never used it like this but I think it could work.