black fabric in a black and white jacket is very weak and shredded after
cleaning. What could have caused this?
A: Certain black fabrics, such as linen, may show damage in
creased or folded areas due to a sizing applied during manufacture to give it a
crisp, lustrous appearance. Many other black or dark colored fabrics may be
damaged by the use of certain types of dyes. In the jacket in question, the
damage appeared only on black panels, a condition that cannot occur in an
immersion care process or during use.
Tests with chemical indicators show the presence of sulfur dye.
If sulfur dyes are not neutralized after dyeing, sulfuric acid is eventually
formed, which can lead to deterioration of the fabric. The damage may not
become apparent until the garment is subjected to the agitation of the cleaning
process. This type of damage has been seen on black knit sweaters, black jeans,
and even dark blue, green, and red garments. Damage is usually extensive and
may be confined to individual panels of an item.
heat and humidity in some sulfur dyes, notably black, can generate sulfuric
acid within the cellulosic fibers. This generation of sulfuric acid causes the
acid tendering in textile goods. Thorough washing, alkaline rinsing in the
dyeing process or resin finishing can eliminate the tendering complaints.