We try to fill all yarn orders with a uniform dye lot. If we don't have the quantity you ordered in a single dye lot, we will contact you to see what you would like to do. If it is a regularly stocked yarn, we can usually backorder the yarn and fill your order when new stock arrives so that the quantity you ordered can be filled from one dye lot. If the yarn is a closeout, or is dyed in small batches, this isn't always possible.