I do some leather crafting and coming up with some of my own special effects for dyes, paints and finishes. I've found mica pigments used for automotive paints or cosmetics work in several different mediums and finishes.
Recently I discovered some liquid oil mediums used mostly for crafting by Pebeo. The Vitrail glass paints and Fantasy Prisme and Moon special effects paints. All three can be used together for different effects as well as with fresh acrylics as they all air dry.
That surprised me as I thought the liquid oils would not permit the acrylic to set properly. The Fantasy paint effects are ones I'm working out my own method of mixing. Some combination of the solvents, mica particles sizes, viscosity, driers? causes the micas to show rheoscopic flow and sets up fast enough to form crater like or honeycomb cell like patterns. I've used the dry micas either applied dry and with alcohol sprayed or dropped on, or stirred into alcohol and applied with a dropper to get somewhat similar rheoscopic effects, then sealed when dry. Once I found the Pebeo paints, the Vitrail transparent and its clear extender, I tried using some of the micas mixed in with the extender. I used several micron sizes of micas together as it is apparent the Fantasy paints have at least 2 sizes, and did get some of the cell type effect but not the cratering. The 2 paints appear to have slightly different viscosities and the mediums are slightly different colors, odor very similar and very similar to the Vitrail.
I am curious about water mixable oils as perhaps another way to try to get this effect. Would it be possible to dilute enough with water to get this 'flowing' sort of effect yet have it dry fast enough the particles don't settle out too evenly? Can alcohol be added to the water to speed the drying? Or another siccative?