In this continuation paper of the work on the chemical and spectrophotometic characteristics of commercial stains, data on the xanthene dyes are presented. In the xanthene group of dyes, it has been found possible to assay pyronin B, eosins B and Y and ethyl eosin by spectrophotometric means. Phloxine B, rose Bengal, and erythrosin B are assayed by die color acid precipitation method. Typical absorption curves are given for these dyes as well as representative spectral and assay data.
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Emery et al. (1950) studied this question.
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