Explanatory notes
… confused with commercial soda, which is sodium carbonate ( heading 28.36 ). Sodium hydroxide is obtained, for example, … compounds (phenol, resorcinol, alizarin, etc.). The heading excludes residual lyes (soda lyes) obtained as … of wood pulp by the alkali or sulphate processes ( heading 38.04 ); from these lyes the tall oil of …