The colour they add to the sauce is FD&C No.40 (Allura Red AC) which is a red dye. It is used as a red food dye. Its appearence is a dark read powder. It can be in sodium salts, potassium salt, and calcium salt.
Its molecular formula is C18H14N2Na2O8S2. Here is a picture of the molecular structure of this dye:
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