Q: I own a promotional products company in Cincinnati. One of my corporate accounts is a large moving company, and I have golf shirts made in Guatemala for its apparel program. The shirts are a 50/50 poly/cotton blend, and the color is a dark heather — similar to charcoal. After the movers wear and wash them a couple of times, the fabric turns a brown or rust color on the high-sweat areas. The strange thing is that the inside of the shirts look brand-new and don't discolor at all. Do you have any idea why this is happening?