We were at a diner last weekend, watching someone whack the bottom of a glass Heinz bottle like they were trying to punish it. The ketchup did not come out. And we realized: most people have no idea the bottle was actually designed to be tapped in a very specific spot, and it's not the bottom.
Look at a classic glass Heinz bottle. There's an embossed "57" on the neck, right where it starts to taper. That number isn't just branding (though yes, the "57 varieties" slogan is famously made up — Henry Heinz picked the number in 1896 because he liked how it sounded, and the company was already selling more than 60 products at the time). The 57 marks the exact spot you're supposed to tap.
Ketchup is what fluid dynamics folks call a non-Newtonian fluid. At rest it's thick and stubborn. Apply the right kind of force and it suddenly flows. Hitting the bottom of the bottle does almost nothing because the force dissipates through the glass. A firm tap on the 57, though, sends a shock right into the neck where the ketchup is actually stuck. Heinz has said publicly this is the intended technique. Roughly 11% of people know about it, according to a survey the company ran a few years back. The rest of us are out here bruising our palms.
The eight-sided shape isn't accidental either. When Heinz introduced the octagonal bottle in 1890, round ketchup bottles were everywhere and competitors were copying each other's designs constantly. The octagon gave Heinz a shape distinctive enough to trademark, which mattered a lot in an era when "ketchup" could mean anything from tomato paste to fermented mushroom sludge (see also: our previous post about ketchup being sold as medicine — the category was a mess).
The flat sides also had a practical benefit. They made the bottles easier to grip when wet, easier to stack on shelves without rolling, and easier to print a paper label onto without the curve distorting the type. Good industrial design usually solves about four problems at once, and this one did.
Somewhere around 2002, Heinz launched the upside-down squeeze bottle with the silicone valve, and the glass bottle stopped being the default in most American kitchens. The squeeze version solved the "getting ketchup out" problem entirely, which is great, but it also killed a small piece of everyday culinary theater. Nobody taps a squeeze bottle. Nobody argues about technique. A minor loss, but a loss.
The glass bottle still exists, mostly in diners and steakhouses, quietly waiting for someone to tap the 57 correctly. Now you know.
If you've got a weird-origin story or bit of everyday design trivia we should chase down next Friday, send it our way.
— Alexander & Amanda @ SBATC
