The pH is a unit of measure by which the acidity or alkalinity of a solution is expressed. The Power of Hydrogen is briefly expressed as pH. The pH value is between 0 and 14. The chemical definition is made as the negative logarithm of the hydrogen concentration.

The pH value of the dyes used in the coloring of the products in the textile sector is used to increase and improve the performance of the dye. In this way, a much better yield is obtained from the paint.

In principle, four main ingredients are used in the manufacture of dyes: pigments, binders, solvents and additives. Pigments are molecules that make up the colors of all objects. Filling pigments are substances that allow the paint to be applied to a certain thickness during the application of the paint. The fillers obtained by natural and chemical means are included in the composition of the paints. The volume ratio of fillers in a finished paint product is an average percentage of 15. The properties that fillers give to the paint are: to increase the durability of the paint against external influences, to prevent the paint from settling quickly, to reduce the rate of moisture transition and to reduce the cost of paint because it is more economical than real pigments.

In order to provide efficacy in paints with high pigment concentration, fillers are added instead of some of the opaque pigments.

For textile manufacturers, the pH value of the aqueous suspension of pigments and fillers is very important for the permanence of the dye. In authorized laboratories, test and analysis studies are carried out to determine the pH of an aqueous suspension. The standard used in these studies is as follows:

• TS 2326 EN ISO 787-9 General test methods for pigments and fillers - Part 9: Determination of the ph value of the aqueous suspension

This standard covers a general test method for determining the pH of the aqueous suspension in a pigment or filler sample.