[Answer] What was added to ketchup in the 1800s to make it red?

Step 1 : Introduction to the question "What was added to ketchup in the 1800s to make it red?"

...In the 1800s, ketchup was a victim of poor sanitation while trying to preserve the tomato product. Manufacturers stuffed it full of preservatives like acid and formalin, with the end result taking on a yellow hue, until coal tar was added to turn it red. Luckily, preservatives have become more sophisticated since then, requiring no coal tar for coloring.

Step 2 : Answer to the question "What was added to ketchup in the 1800s to make it red?"

Coal tar:

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