Not the old silkspan, but doctor's exam paper that is an acceptable substitute:Lightweight silkspan = https://www.amazon.com/dp/B0017TMTCA/?coliid=I228GV3WS5HA4F&colid=DY6RQZPXBG3L&psc=1&ref_=lv_ov_lig_dp_itMedium silkspan = https://www.amazon.com/dp/B071J8H8KW/?coliid=I2F0ZLMLOR93XI&colid=DY6RQZPXBG3L&psc=1&ref_=lv_ov_lig_dp_it