I understand that Retayne is used to set or hold color in fabrics. I am printing some things on the computer to use as quilt blocks and in my trials the black holds its own but the color seems to fade. I have pre-washed fabric w/o softener and also tried the prepared 8.5 x 11 fabric sheets that you can purchase. I wondered if Retayne would help this - I have never used this product only heard of it. Any advice on this would greatly be appreciated.