Checking the NAOH from Loja Quimica. Placed 30.74 g on a "stainless" steel cup (tare 44.48 g). Heated on electric stove. Melted with little bubbling. At over 140 C (off therm. scale), a "rust" came off the can, turning the mass brick-colored (S1). Weight after cooling: 29.20 g (lost 1.54 g). Poured into beaker, washed can with a little H2O. On cooling solidified into light brick orange mass, hard and adhering to the beaker. ----------------------------------------------------------------------