
1) Food coloring 2) Litmus
Found on
https://www.crosswordclues.com/clue/turnsole

Turnsole or folium was a dyestuff prepared from the annual plant Chrozophora tinctoria. ==History== Turnsole became a mainstay of medieval manuscript illuminators starting with the development of the technique for extracting it in the thirteenth century, when it joined the vegetable-based woad and indigo in the illuminator`s repertory. However, t....
Found on
http://en.wikipedia.org/wiki/Turnsole

• (a.) Litmus. • (a.) The euphorbiaceous plant Chrozophora tinctoria. • (a.) The sunflower. • (a.) A purple dye obtained from the plant turnsole. See def. 1 (d). • (a.) A plant of the genus Heliotropium; heliotrope; -- so named because its flowers are supposed to turn toward the sun. • (a.) A kind of spurge (Euphorbia ...
Found on
http://thinkexist.com/dictionary/meaning/turnsole/

1. <botany> A plant of the genus Heliotropium; heliotrope; so named because its flowers are supposed to turn toward the sun. The sunflower. ... A kind of spurge (Euphorbia Helioscopia). ... The euphorbiaceous plant Chrozophora tinctoria. ... 2. <chemistry> Litmus. A purple dye obtained from the plant turnsole. See def. 1 . ... Origin: F...
Found on
http://www.encyclo.co.uk/local/20973

Turnsole was a violet-blue or purple substance obtained from a Mediterranean plant (Chrozophora tinctoria) of the spurge family formerly much used for colouring jellies, confectionery, wines, etc, and as a pigment.
Found on
http://www.probertencyclopaedia.com/browse/AT.HTM

turnsole, turnsol 1. A plant of the genus Heliotropium; heliotrope; so named because its flowers are supposed to turn toward the sun; such as, the sunflower. 2. A purple dye obtained from the turnsole plant. Related 'sun' word family: helio-.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1978/6

any of several plants regarded as turning with the movement of the sun. · heliotrope (def. 2). · a European plant, Chrozophora tinctoria, of the spurge family, yielding a purple dye. · the purple dye prepared from this plant; litmus.
Found on
https://www.infoplease.com/dictionary/turnsole
No exact match found.