Lizbetgutierrez
Both, the reddish spots are rust and a chemical change. You will also find (after you have rubbed off the rust) that the surface of the knife is pitted. These pits are a physical changed caused by the chemical reaction.
Wiki User
∙ 9y agoWiki User
∙ 9y agoThe appearance of reddish brown spots on bread knife are a sign of chemical reaction
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