Musgraves were proofed by a recognised Proof-House. The dough is then proofed using ideal temperature control, and then baked. The dough can then be proofed a second time. This mixture is then proofed to allow fermentation to take place. The body was claimed to be "rust proofed". Damascus barrels are safe to shoot (where proofed) only with black powder charges. It was available in stockinette proofed with black rubber, or proofed fawn twill. Screw in chokes come as lead or steel proofed versions. The first copy is proofed again for errors before starting the printing run. Commercial structures can be elevated or flood proofed to or above this level. But servo controllers proofed inadequate in achieving the desired level of automation. But many measurements and evidence proofed scales are used to examine attitudes. While at Yale, Serra proofed Albers' book "Interaction of Color" (1963).