In short, colorants that have less affinity to fabric shift through evaporation of the solvent then are left on the spot, thereby producing a color patch.

Tumble drying seldom sees such a problem, however, in the case of spontaneous drying, special routes are formed for the solvent to evaporate through and this leaves colorants behind to be accumulated on the spot after evaporation.

Trying to prevent the formation of such channels would be a key to avoiding this kind of trouble. Also, attention should be drawn to colorants that accumulate on parts that are hard to dry. For there are resins and residues that naturally tend to take in solvents, any manipulation that makes it harder for those parts to dry must be avoided. There will be an increasing number of quilted down coats to be dry-cleaned towards early spring. The stitched parts should be handled with much consideration.

(T.T.)