Some fabrics have a lot of excess dye which can
cause discoloration on other fabric but also on your
sewing machine. This discoloring may be very
difÀ cult or impossible to remove.
Fleece and denim fabric, especially red and blue,
often contain a lot of excess dye.
If you suspect that your fabric/ready-to-wear
garment contains a lot of excess dye, always pre-
wash it before sewing to avoid the discoloring.