The coloring principle of turmeric, or curcuma root, extracted as an orange yellow crystalline substance,
C14H14O4, with a green fluorescence. [
1913 Webster]
" It possesses acid properties and with alkalies forms brownish salts. This change in color from yellow to brown is the characteristic reaction of tumeric paper. See Turmeric paper, under Turmeric."
[1913 Webster]