Scoville, and why it misleads

The Scoville number is the most quoted and least useful figure in the trade.

What the number is

Originally a dilution test: how much sugar water it took before a panel stopped detecting heat. That is a sensory method with human panellists, and it produced the wide ranges still quoted today.

Modern measurement is chromatography, which reports capsaicinoid concentration directly and is then converted to Scoville units for familiarity. The number you see is usually a conversion of a real measurement wearing an old unit.

Why the ranges are so wide

A variety is not a fixed heat. Published ranges for a single pepper often span a factor of three or more, because heat varies with growing stress, sunlight, soil, ripeness at picking and the individual plant.

So a recipe specifying a variety is specifying a range, not a value. This is the mechanism behind a batch that comes out hotter than the last with nothing changed on your side.

What buyers think it means

At a market, a Scoville figure reads as a promise of intensity and as a challenge. Both are risky. The promise is one you cannot keep batch to batch, and the challenge attracts the customer who buys once for a dare and never returns.

The customer worth having asks what it tastes like. Heat is the thing they can get anywhere.

What to put on a label

A number you have actually measured on your own product, or no number. Quoting the published range of the variety is describing the pepper, not your sauce, and the difference matters if anyone checks.

A simple comparative scale of your own line is more honest and more useful: this one is hotter than that one. Customers navigate a range far better than they interpret a five-digit figure.

References