What the ketchup flow test measures
“Fancy” can be a formal ketchup grade, and the flow test turns a quality judgment into something measurable. A sample is placed in a narrow, level trough behind a small gate. Once the gate is lifted, the ketchup spreads under its own weight. The tester records how far it travels in 30 seconds; under the standard described here, it must not reach 14 centimeters.
That makes the test a check on consistency—how thickly the ketchup holds together and pours—not a timed challenge for the bottle. The controlled trough and interval let inspectors compare batches without relying only on someone’s impression that one seems runnier than another.
Why consistency matters
Ketchup is a mixture of tomato solids, water, sugar, vinegar, and seasonings. Its texture depends partly on how those ingredients are processed and how the tomato particles interact with the liquid. If a batch flows too readily, it may feel thin; if it barely moves, it may be difficult to pour. A flow measurement gives graders a practical way to set a boundary between acceptable textures.
But the test does not, by itself, tell you everything about a ketchup’s quality. A formal grade can involve other characteristics too, such as color and flavor. The flow test captures one important feature in a repeatable form: how the ketchup behaves when gravity, rather than a squeeze, gets to decide.
