Originally Posted by mariposa-art
I suspect that the lean medium is specifically meant for their paint. I did some studies with Chroma Archival oils and used Liquin, until I read that Chroma wants you to use their mediums only. I guess their paints are formulated special and work best with their special mediums....
This really piqued my curiosity, so I poked through the Chroma site to find their health/safety sheets. They're quite forthcoming: their paints include a proprietary alkyd drier (2%, so not much) and a highly active isoparaffinic hydrocarbon solvent (5%). And a "preservative," 1% -- no idea what this is for.
I can only guess that the solvent is to speed up or make more effective the milling process.
It's probably the alkyd that doesn't want to mix with other alkyds foreign to Chroma. Not that I'm an expert, but Wikipedia assures me there are different alkyd types with vastly different drying characteristics. Mixing them might cause unpredictable results.
However, my GUESS is that the Chroma mediums can be mixed with any conventional oil paint -- that is, paints that do NOT contain other alkyds. But MetinYilmaz's strategy of contacting Chroma is definitely the right idea... let's hope they answer the question straightforwardly.
Judging a Manet from the point of view of Bouguereau, the Manet has not been finished. Judging a Bouguereau from the point of view of Manet, the Bouguereau has not been begun.
--Robert Henri, The Art Spirit