If you have ever sat at a diner table with a classic glass Heinz ketchup bottle, tipping it at increasingly desperate angles while your french fries go cold, you were missing something that has been printed on the bottle the entire time. The number 57 embossed on the neck of every glass Heinz bottle is not just a brand marking or a historical reference. It is a functional instruction — a sweet spot that, when tapped firmly with the heel of your hand, releases the ketchup cleanly and quickly without the thumping, shaking, knife-fishing, and bottle-smacking that most people resort to. The fact that almost nobody knows this is, at this point, one of the most widely shared condiment secrets in culinary history — and yet most people are still doing it the hard way.
What the 57 Actually Does
The trick is straightforward. Hold the glass Heinz bottle at approximately a 45-degree angle, with the opening pointed down toward your plate. Locate the embossed 57 on the neck of the bottle — not the label lower on the bottle, but the number raised into the glass itself where the bottle narrows. Apply a firm, sharp tap directly to that spot with the heel of your hand or two fingers. The ketchup will flow. Heinz has confirmed this directly — a company spokesperson told TODAY Food in 2017 that the 57 on the neck is specifically the sweet spot, and that tapping it firmly where the bottle narrows releases the ketchup significantly more easily than striking the bottom of the bottle or shaking it. The Heinz FAQ section on the company's website has also noted this trick explicitly, describing it as something very few people know.
The physics behind it are the same principles that make tapping any viscous liquid container at the right point effective. Ketchup is a non-Newtonian fluid — specifically a shear-thinning fluid, which means it behaves like a solid when no force is applied and like a liquid when stress is applied. Striking the bottle at the narrow neck point where the ketchup is most concentrated creates a pressure wave that travels through the contents and breaks the ketchup's resistance to flowing more effectively than hitting the base, where the force disperses before reaching the ketchup column above it. The 57 marks exactly the spot where this effect is most reliably produced.
