Proof 1840 Rainbow Trials, state 2, in deep red-brown on white wove paper and an example from State 3 in deep blue on white wove paper dipped in prussiate of potash, both from position 10 in the sheet; minor surface faults, otherwise fine. Photo

细节
Proof 1840 Rainbow Trials, state 2, in deep red-brown on white wove paper and an example from State 3 in deep blue on white wove paper dipped in prussiate of potash, both from position 10 in the sheet; minor surface faults, otherwise fine. Photo