Artificial dye-stuffs; their nature, manufacture, and uses (1917)
Ramsey, Albert R. J, Weston, H. Claude (Hubert Claude) · London, Routledge; New York, Dutton · leaf 134
+ — OH -OH I molecule ofphthalic anhydride OH |^;-0H 2 molecules of resorcinol.OH = 2H20 + … Abstracting the pyrone ring from this formula, itmay be expressed thus— /°\ = C C = =c 120 THE ARYLMETHANE DYES Fluorescein is a dark-red crystalline substance in-soluble in water, but soluble in alcohol and alkalies.A solution of its alkali salts in water possesses abeautiful green fluorescence,…
Dyes and dyeing
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