Abstract
A procedure for the qualitative and quantitative determination of dyes after thin-layer chromatographic separation is developed using an example of five synthetic food colors: Brilliant Blue, Tartrazine, Sunset Yellow, Ponceau 4R, and Azorubine. The chromatogram is scanned and saved in Windows 95/98 raster image format and processed by the Adobe Photoshop 5.0 program package. The procedure is applicable even when the dyes are incompletely separated on the chromatogram.
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