In their website and in the safety data sheet they don’t mention any solvent, although the sentence “Odour: weak aromatic” is a bit suspicious. But I don’t understand what kind of medium you need: Liquin is fast drying, Medium W makes oil paint water-soluble, but it doesn’t seem to accelerate significantly the drying time (“harmonizes drying process” doesn’t mean much to me). So, if you don’t need a fast drying medium, just use linseed oil (thicker) or walnut oil (thinner); if you need a fast drying medium, some people have successfully used Gamblin Solvent-Free Fluid or Gel.

Reach out to Sennelier through their contact email on their website to inquire about it’s safety as a pregnant woman. From my experience art supply manufacturers are quick to respond to emails, usually within a business day or two.

Just a note though, some plastic bottles are very cheaply made and not designed for holding some chemicals. Water bottles are sometimes made out of a very inexpensive plastic that reacts when exposed to some acids. It may be that the Alkyd acidity is high enough to make the bottle deform in the presence of it.

This might be an interesting thing to study for an in house science project with the kiddo when they get older, should definitely try and remember it.

I didn’t know about this product until I stumbled across this thread. Apparently, it turns all oil paints into water-mixable paints. Wow.

How does it work in terms of blending, glazing? In other words, suppose I want an ultra-smooth gradation of blue to red. Does this medium help or aid the properties of oil paint that drew us toward oil painting in the first place?