As an archivist, it is my hope & non-denominational prayer that this "memorabilia" goes into an institution for safe keeping and sharing with interested scholars and students. Perhaps Emory, Clark or Rutgers? And welcome, by the way!
I suppose Heinrich Kuhn would have been using the Lumiere process... he was working in color around that time as well. Neat exhibition of his work at the Museum of Fine Arts, Houston right now.