BTZSBeyond the Zone System
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(11) It was shown previously that mainly HPTs have very low-vapor pressure and show best photopermanence followed by BTZ, BP, and then Ox.
(12) Here it was clearly shown that HPT outperformed BTZ in most automotive applications.
Based on these results, it is apparent that the used triazine HPT-4 chromophores significantly outperform the conventional BTZ in terms of photopermanence.