Do wash and dry them ... Wash similar colors together using lots of warm water and either a bit( about 1-2 teaspoons) of dawn dish detergent or sythropol to release any unset dye. . Batiks because of the tight weave do not always have needle holes that "close- up" when washed. It depends on the size of needle used in the stitching. The only way to find out is wash and dry some to see what happens to the holes.