I have recently finished a batik quilt for my SIL. 1 of the fabrics she chose was a deep burgundy that I prewashed 'just to be safe'. It ran a LOT. Used the above recipe then purchased Retayne & washed 2 more times, each time with a couple of color catchers. The last time there was just a faint pink of the color catchers. Should I get her Synthrapol along with color catchers or will it be safe with just color catchers now??? Thanks.