Tornisol

(lat. Torni solis) litmus; a natural colouring substance derived from seaweed and produced in the Netherlands in a form of oblong cuboids or stripes of linen or paper saturated with the substance. Depending on the environment, it gave a red or blue colour. Tornisol was also used as an ingredient in selected remedies.

Source: BCz, ref. no. 6007, vol. 1, pp. 45–46, 50–53, Cukiernia: ekspens na cukiernią wypisany d[ie] 6 May 1716.

See also: B. Popiołek, Między kuchnią i spiżarnią. Magnackie regestry wydatków kuchennych w osiemnastowiecznej Rzeczypospolitej, Warszawa 2025.