sentence: Blacksmiths can cover the hot metal with sand, so that it takes hours to become cold.
sentences_before: To 'anneal' iron or steel, a blacksmith heats the metal until it no longer pulls a magnet, and then makes the metal become cold very slowly.
sentences_after: This makes iron or steel very soft.
concept_name: blacksmith
headings: Blacksmith Hard Iron and Steel
categories: Occupations