1980 Volume 21 Issue 3 Pages 117-121
The nature has been investigated of the clothes yellowed by oily soils. The methods have been investigated to recover whiteness and to prevent yellowing. Natural and denatured oily soils and yellowish matters coexist on the clothes. These three kinds of soils have each specific nature. The denatured oily soils can more easily be removed than the natural oily soils by laundering. The yellowish matters, which are slight in volume and insoluble in organic solvents, are the most important causal matters which increase remarkably the yellowing of the cotton fabrics after a long period of storage.
The rate of denaturalization of oily soils and degree of yellowing due to yellowish matters are dependent on the kind of fibers and period of storage. The characteristic of yellowed fabrics and degree of recovery of whiteness are also dependent on them.
The bleaching or washing by hot water is effective to recover the whiteness of cotton fabrics yellowed by oily soils.
