Noun
the heat or the color of fire
Source: WordNetAs no metallurgic processes were used to separate iron from nickel, the alloy was used as it was. citation Meteoric iron could be forged from a red heat to make objects such as tools, weapons, and nails. Source: Internet
A few types of tube permit operation with the anodes at a dull red heat; in other types, red heat indicates severe overload. Source: Internet
Silver does not react with air, even at red heat, and thus was considered by alchemists as a noble metal along with gold. Source: Internet
Its reactivity is intermediate between that of copper (which forms copper(I) oxide when heated in air to red heat) and gold. Source: Internet