. Chemistry of dye-stuffs. OH OH Br. OH CO. = CaH, c O Br :<z^-oH .Br + 2H,0 .0 Br ^-OH BrEosine. XANTHENE DYE-STUFFS. 195 Of course, this also demonstrates the position of thehydroxyl groups in fluoresceine. Still more handsome, and at the same time faster, thanEosine are its ethers, :— Spirit Eosine, Eosine S, Primrose, etc., the potassium saltof tetrabromofluoresceine ethyl ether, corresponding to theformula :— Eosine Scarlet, Eosine BN, Safrosine, is the sodium saltof a dibromodinitrofluoresceine. Erythrosine, Soluble Primrose, etc., is the iodine deriva-tive of Fluoresceine corres
. Chemistry of dye-stuffs. OH OH Br. OH CO. = CaH, c O Br :<z^-oH .Br + 2H,0 .0 Br ^-OH BrEosine. XANTHENE DYE-STUFFS. 195 Of course, this also demonstrates the position of thehydroxyl groups in fluoresceine. Still more handsome, and at the same time faster, thanEosine are its ethers, :— Spirit Eosine, Eosine S, Primrose, etc., the potassium saltof tetrabromofluoresceine ethyl ether, corresponding to theformula :— Eosine Scarlet, Eosine BN, Safrosine, is the sodium saltof a dibromodinitrofluoresceine. Erythrosine, Soluble Primrose, etc., is the iodine deriva-tive of Fluoresceine corresponding to Eosine. If the preparation of Eosines be undertaken from dichloro-phthaHc acid, the products are of bluer tinge and handsomerthan the Eosines themselves. E. Noelting was the first tomake them in this way. A fact of theoretical interest in thisconnection is that the introduction of chlorine or bromineinto the phthahc acid radicle of Fluoresceine does not effectthe alteration in the properties of the resulting
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