Chip and Dip Day

What the day is

Chip and Dip Day is observed on March 23, and applies to any chip, which distinguishes it from Potato Chip Day on March 14. The pairing is a mechanical problem before it is a culinary one.

Origin and background

A chip pushed into a dip works as a cantilever: it is held at one end and loaded at the other, and it fails by snapping near the fingers. The standard defense is corrugation. Ridges are not decoration but structure, since a folded sheet resists bending far better than a flat one of the same thickness, which is the same reason corrugated cardboard and profiled roofing are shaped the way they are. Scoop shapes work differently, using a curved cross section to gain rigidity the way a length of angle iron does.

The dip has to cooperate. What makes one scoopable is yield stress, meaning it behaves as a solid until enough force is applied and then flows: it must hold its shape on the chip rather than running off, yet still give way to the chip going in. Too stiff and it breaks the chip, too loose and it drips.

Hot cheese dips fail in a specific way. Heating cheese too far makes the protein network contract and squeeze out fat, which is the greasy separated pool people recognize, and the usual fix is a starch or an emulsifying salt that keeps the fat dispersed. It is why processed cheese melts so obligingly.

Double-dipping has actually been studied rather than merely argued about. Researchers measured bacterial transfer from a bitten chip into a dip and found a real, measurable increase, with thinner and more acidic dips carrying less than thick ones.

How to take part

• Match chip to dip. Thick dips need ridges or a scoop shape.
• Load the chip at the tip and keep the lever short.
• If a warm cheese dip splits, a little starch will usually pull it back.
• Use a spoon to serve onto a plate at gatherings.
• Do not double-dip. The research is not on your side.