I've never done it but I'm sure it can be done. I use Golden brand artist's liquid pigment. I suspect Reikland is somewhere between an Iron Oxide or Burnt Sienna (on the brown side) and maybe a Cadmium or Crimson or Magenta (on the red side). Id get some small vials of each and some matte medium and water and start experimenting. My one insight is that you'll need more pigment than you'll think. Also, document your ratios carefully... when you get it right you want to recreate it.
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