[Unusual burns in older boys]

The authors give an account a less frequent mechanism of burns in older boys during the domestic manufacture of smoke-boxes from a mixture of sodium dithionite (decolourizer) and urea peroxyhydrate (solid hydrogen peroxide). The chemical reaction explains the development of exogenous heat and the depth of burns. The authors analyze their own material of 16 patients and emphasize early necrectomy and prevention.