Old Holland Indian Yellow-Orange Lake Extra, Transparent, duel-toned, permanent synthetic.
Duel-toned means that two different colors are possible from the same pigment.
One is the mass opaque top tone and one transparent undertone by adding medium or white.
A simple glaze of this pigment will turn Cyan into Green, it can warm up any color.
Indian yellow brown side mixes with cyan to make a cleaner green because it has less red in it.
Magenta and Indian yellow orange-golden side make a stronger red while Indian yellow Brn/s and cyan make a stronger blue or green.