“Fancy colours” is the contemporary term for underglaze printing on pottery in shades other than blue.
Blue, black and brown were possible from the earliest period as these colours derived from metal oxides which would withstand the temperature of a subsequent glaze firing.
Other colours were introduced from the late 1820s as and when the technology was developed.
Green prints were in use from perhaps as early as 1825, but definitely in prodcution from 1828. More …