How Chromatography Filter Paper Works?
How Chromatography Filter Paper Works

How Chromatography Filter Paper Works?

Chromatography Filter Paper

By simple chromatography filter paper the levelling properties of a product for direct or reactive dyes  can be checked in a very short time.

Preparation of the test :

A circular glass, i.e. a watch glass, (A) is filled up to the half with the same composition as the dye bath, but without the dyes.

The dyes (Yellow, Red and Blue plus a combination of Y, R and B ) are drawn on a quarter of a circle at about 2 cm. from the center (C) of a filter paper with 15 cm. * (B).

A piece of filter paper is twisted and inserted into the center (C) of the filter paper (A). The dyeing bath is then coming up by capillary through the center of the filter paper.

Dye selection   

Reactive Red 195

Reactive Blue 19

Reactive Blue 21

Reactive Navy 1

The solutions are prepared at 10 %)

Auxiliary             

0 – 0,5. – 1 g/l of the tested product

Temperature    

Room temperature

Time for chromatography

From the moment the dyeing bath enters the center of the filter paper A at the point C the chromatography should run 20 minutes before taking away the filter paper C.

Evaluation         

The first evaluation is visual but it is possible to prepare a diagram by measuring the distance from the center to the last ring observed on the Chromatography filter paper.

Written By - Dr. Stef, CTO, Lorel Chemical co. Ltd, New York, USA

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