You will need to double check, preferably in writing with the mill, that there have been no chemical treatments of any kind done to the wood. My son was using balsa and pine sheets in his HS architecture class and wondered what was causing a slight skin reaction. It took a while but we finial figured out that the wood the school was using had some sort of adhesive agent impregnated in the wood to reduce warping, splintering, and splitting. Whatever the mill treated the wood with did not alter it's appearance in any way from the untreated wood he uses at home for his modeling projects.
