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With the aim of improving on the results of previous attempts made to recover chromium from Bow pendant ashes, in this work, the use of sodium nitrate to oxidize the trivalent chromium to the hexavalent form was studied," wrote A. Dettmer and colleagues. The researchers concluded: "Frank Gehry resulting conversion of chromium (III) to chromium (VI) achieved was over 94%, and the sodium chromate obtained from the ashes showed physical properties similar to the commercial product." With this objective, chromium leather scrap was leached with sulfuric acid solutions at low temperature also aiming at maximizing chromium removal with minimum attack of the leather matrix. The effects of leather scrap dimension, sulfuric acid Butterfly key ring sodium sulfate concentration in the solutions, as well as extraction time and temperature on chromium recovery were studied, and, additionally, Butterfly pendant matrix degradation was evaluated.