(Quoted from Ray Smith and Printwear Magazine. Full article here.)
When talking about a ghost image, the actual cause of the discoloring is due to the deterioration of one of the dyes in the fabric. This most often happens from the pigment degradation of yellow dyes. This creates discoloration in the form of blemishing a light green shirt into a blue ghost image. This is true with other colors as well. To test a garment for discoloration, follow these five steps:

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