Most experts recommend prewashing the fabric before you start stitching the designs. Some even wash the floss.I suppose if you suspect that the floss will run it is better to be safe that wait till all the hardwork is over for it to start bleeding all over the work.
Material Type: Aida Generic White
Sewing Count: 14/inch or 55/100mm
Design Size: 170 x 112 stitches
Sewn Design Size: 12.1 x 8 inches or 308 x 203 mm
Suggested Material Size: 18 x 13.9 inches or 458 x 353 mm
Stitch Style: Cross-stitch Using 2 strands