Screening method for foam dyeing chemical

The invention belongs to the field of textile printing and dyeing, in particular to a screening method for a foam dyeing chemical. The screening of dyes is operated by measuring the foaming effect in the invention, which comprises the following steps: (a) flat proof. Monochromatic disperse dyestuff and reactive dyes are weighed and mixed with water. Then the mixture is subject to slow stirring and accelerated stirring successively. (b) measurement of foaming effect. Record the time required during the process of lather collapse to half the amount of liquid separated out. The screening of dyes is operated by measuring the foaming effect in the invention, thereby saving the time of screening and lowering the difficulty of measuring Rf value in prior art.