Gamboge is a partially transparent, reddish yellow pigment.
First used as a colour name in 1634.

Gamboge is an extract from the Gamboge tree; a species of evergreen trees of the famliy Guttiferae (or Clusiaceae) which grow in the eastern part of the world. The resin is extracted after the tree has grown for 10 years.

This extract is responsible for the colour of Buddhist monks' robes, as they use the gum resin as a dye.

The synthetic version of this colour is not very different from its natural counterpart.

- and Wikipedia