Due to the significant stability of metastable states each color persists for many hours at ambient temperatures rendering this system fully light-responsive without interference of thermal isomerizations. To establish path-independence we conducted a permutation experiment in which every possible sequence of the four state interconversions was realized within one switching sequence (see Figure and also Supporting Information for further details). This experiment revealed actual complete path-independence and consistently the same high state enrichment regardless of the previous interconversions and starting points.