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从网上找的答案:, U" o0 M8 }6 e( C x9 v
4 }9 p( ] ?# m1 z3 E+ j7 ] It is dark on the inside because it is not exposed to oxygen. Oxidized meat starts to turn brown. The longer it sits the browner the outside gets. It is not bad and occurs a lot where pigments aren't used and meat is shipped in rather than ground fresh. $ u4 ~+ {% o+ }' k, k+ \
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by Kenny
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, J7 q$ O7 B( @4 `2 R Contrary to what some people say, the "butchers" do not add any dye to color meat, none. This color difference is natural and to prove a point very simply, take two cuts of beef, prime steaks or whatever, knowing they are the same color on each side, place together so each piece is next to the other and place in fridge overnight, in the morning the two outside parts will be red, and the inside where the two touched will be very dark or black.7 O% }6 S4 R. |: X1 `0 r
This is the reason meat markets place paper, the butchers grade, between steaks and other cuts when displaying in the counter, to stop color change.4 Z9 l2 b$ v1 A; s
Again, they do not use dye. Some shops add water, but no dye, its against the law in most states. |
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