You want to make sure the description says "100% sulphite" white drawing
paper. Some sneaky distributors use the word sulphite but it may describe
only some sheets or colors in a package. An exhibitor at the NAEA
conference told me about this trick and I've passed on the information to
our school district art teachers and buyers.
If you have a problem with a shipment insist that the distributor take it
back and replace it with the correct item.