What is the ingredient in Bob Ross' Liquid white/Clear that makes oils more blendable?

The basic recipe for Liquid White is


equal parts each Titanium White paint, Linseed oil and Thinner (either Turpentine or Mineral Spirits).


For slower drying, add more linseed %26amp; for faster drying use less oil and more spirits.What is the ingredient in Bob Ross' Liquid white/Clear that makes oils more blendable?
Paint thinner.


(I should say linseed oil but it is really just that he sold them thinned out)


You can get the same effect with linseed oil anyhow, but it will likely yellow over time.


I think it is better to but a bit better oil for that.What is the ingredient in Bob Ross' Liquid white/Clear that makes oils more blendable?
Liquid white is Titanium white, thinner and linseed oil.