Intense Blue (Phthalo Blue) is a deep intense blue which when undiluted, forms an inky blue-black. It is made from the modern pigment Phthalocyanine which was introduced in the 1930s.
Hooker's Green Dark is a rich dark green with a blue tint. A mixed pigment colour, it was originally created by 19th c English botanist illustrator William J Hooker.
Sepia is a black brown colour. Originally made in the 18th from the ink sacks of cuttlefish, it is now made from a mixture of carbon and umber. It is a highly permanent colour.
