First off, you said they are batiks, what brand?
REAL batiks are washed so much that rarely do they bleed, it is the painted ones from India you have to watch out for.
SEcondly, there is is retayne and synthropol you can use to stop bleeding!
Synthropol is what you would need, IF you really needed it.
Thirdly, did you TEST it to see if would bleed?
while dry, rub a clean white paper towel briskly over the fabric...see any color? IF so, you might never get it to stop bleeding! IF not, but you are still not sure, then take a small piece, and put into a bowl of HOT water...did it bleed? wring it out on a dry white paper towel...without rinsing it first...see any color? If so, then wash it in cold water with a little detergent and rinse it three times!
Re-test it again!
If NO color after the hot water test, then continue on about your business!
HOWEVER, this is a pet peave of mine, ALl fabrics should be washed, due to the chemicals put on them to get them into this country. Batiks in general because they are mostly Painted and have more chemicals on them!
To wash your fabric, you MUST remove the selvages or it will not shrink properly! You can clip the corners about 1/2", but that does not always work!
Either way, if they are batiks, they are tightly woven and you will not really LOSE that much fabric! Some fold them into 1/4's and then safety pin on all four corners...it does help quite a bit!