Greeting card illustrating Wilhelm Ostwald’s colour theory. Printed in England on a light cream, 300gsm carbon-neutral Italian paper, made from 100% recycled post-consumer waste.

Adapted from a colour theory diagram by chemist and Nobel laureate, Wilhelm Ostwald (1916). Ostwald introduced grey-scale value or brightness into colour theory, influencing Piet Mondrian and the De Stijl movement.

All our greeting cards are 170mm x 120mm (approx. 5” x 7”) and blank inside, individually wrapped in a compostable wrapper made from plants, with a 100% recycled, 110gsm kraft envelope.