A book of dye samples, c 1910.

A book of dye samples, c 1910.

Sample of picric acid, (2,4,6-trinitrophenol), late 20th century.

A selection of early synthetic dyes and dyed material, mid 19th century.

Sample cards of coloured casein plastic buttons, c 1950s.

Sample book of dyes and mauve shawl, c 1862.

Sample of indigo dye, 1999.

Display card of samples of 'Erinoid' plastic, c 1930s.

Display card of samples of 'Erinoid' plastic, c 1930s.

Molecular geneticist loading samples onto an automated DNA sequencer.

Samples of casein plastic, c 1920-1960.

Dye-fastnes test card showing fading, c 1903.