And he was not now scornful of a green-scummed water-hole with its white margin of alkali.
"Wildfire" by Zane Grey
A dark green coloration is given with ferric chloride; and upon boiling it with alkalies or dilute acids, caffeic acid and glucose are formed.
"All About Coffee" by William H. Ukers
The blue colour of vegetables is turned red by acids, and green by alkalies.
"Practical Education, Volume II" by Maria Edgeworth
Acids turn vegetable blues red, alkalies turn vegetable blues green and vegetable yellows brown.
"Household Administration" by Various
It is thus obtained as an olive green precipitate which is insoluble in acids and alkalis.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7" by Various