The scientific literature, the ISO standard and the restriction all focus on the release of Cr VI) from leather, without considering the release of Cr III).
Following the release of a keyboard made of leather, the Japanese can now buy golden keyboards.
There is a possibility that the measured amounts of released Cr VI) in the extraction solution are underestimated when the leather sample is ground or cut into small pieces as compared with whole leather surfaces, owing to the parallel release of reducing species from the leather.
The results suggest that Cr VI) might still be released after 3 hr in the case of leather with high extractable amounts of Cr VI) (as in this study).
It is of importance for further discussions on allergic Cr contact dermatitis to consider that the release of, for example, acids from the leather is also time-dependent, and predominantly takes place during the first hour of exposure.
The soles are of leather and are designed to slide smoothly across the approach boards as you prepare to release your shot.
Upon release, "Tuscan Leather" received critical acclaim from music critics, recognizing it as one of the most powerful intros to a hip-hop album in years.
In this study, it was shown that the geometrical surface area of leather exposed to the solution is a more relevant parameter than the leather dry mass for normalization of release data.
This is also in agreement with other studies investigating the release of Cr III) and Cr VI) from Cr-tanned leather (20, 21, 40, 45, 61).
The reduced amount of released Cr VI) analysed in solution is most likely a result of the parallel release of acids and/or reducing agents from the leather (43).
