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the blackish-red stuff that forms on ketchup bottles is a chemical change because things that change colour are mostly chemical reactions i think that's the reason why but i am not sure , but i hope i helped whoever is reading this.

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Wiki User

12y ago
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Wiki User

11y ago

It's a chemical change because the ketchup's bond broke so it can not be put back to ketchup no matter what you do.

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Wiki User

14y ago

It's just ketchup that has dried and hardened.

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Aaron Lingden

Lvl 2
3y ago

yos

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Q: What is that blackish-red stuff that forms on old ketchup bottles?
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