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

170mm x 120mm (6 3/4" x 4 3/4"). Blank inside.

Individually wrapped in a compostable bag with a 120gsm recycled kraft envelope.

Printed with vegetable-based inks on a carbon neutral press using responsibly sourced, 300gsm Italian paper.