Every brand makes it with the same pigments: PR101 Red Iron Oxide.
Who makes it
- M. Graham Artists' Oil Color No. 187
- Grumbacher Pre-Tested Artists' Oil No. P215
- Williamsburg Handmade Oil Colors No. 6001922PR101LF I TransparentSeries 437 ml tube · 150 ml tube · 8 fl oz can* · 16 fl oz can*About Williamsburg
Sizes are the ones each line is sold in; marks a size only some colors come in. Check the store for a particular color.