fire scale

[′fīr ‚skāl]

(metallurgy)

Copper oxide remaining below the surface of silver-copper alloys after annealing and pickling.

References in periodicals archive ?

The fire was ranked quite dangerous with number two on the five-point fire scale at 23:17 Moscow time on Friday.

Two People Died in Major Fire at Pokrovskaya Hospital in St Petersburg

The medallions of pork tenderloin in a creamy blue cheese and mushroom sauce was at the other end of the fire scale. Slender slices of tender meat lay in a Stiltonesque sauce which the bread helped us enjoy to the max.

El of a party at tapas bar

Flux is applied to the copper liberally to reduce fire scale. The copper is heated to a dull red appearance and may be dipped either into a Sparex solution (a mild synthetic acid recommended for school use) immediately after annealing, or allowed to cool slowly.

Jewelry without solder

We use Sparex as a cleaning solution to tkae the fire scale off the metal.

A jewelry unit for middle school

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