What are the reasons for holes in dyeing and finishing?

(1) The amount of acid and oxygen water is too high;

(2) There are more iron ions in the water quality;

(3) If the hole is regular, there is a problem with the equipment;

(4) The "temperature + time" parameter is improper;

(5) Holes in bleaching are caused by the reaction of hydrogen peroxide and iron ions in most cases;

(6) The purity of hydrogen peroxide and alkali is excessive;

(7) Whether water softener is added for pretreatment and dyeing, and the metal ion content in the water may be too high;

(8) The hydrogen peroxide caused by heavy metal ions quickly decomposes locally, causing holes.