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Controlling the color or hues of dye solutions is a popular phrase for the industries dealing with colorants, namely textile, paint, ink industries, pharmaceuticals, processed food industries etc. A diversity of shades is regularly produced by mixture of colorants in color industries. One of the most important problems in this process is to find the exact proportions of colorants in order to produce a match for a target shade. Ink quality is closely associated with color and the use of ink colorants has been an age-old practice, enhancing the aesthetical appeal of inks. The appearance of the ink color is one of the deciding factors for market value and demand of a particular company or brand in the writing instruments market [1].

Determination of Rhodamine B and Rhodamine 6G dyes in Various Ink Samples by Zero Crossing Method: First Derivative Spectrophotometry