FAQ: is there a visual difference between blue1 and blue2?
Answer: I am afraid not.
There were rumours / assumptions that blue2 may also produce a limited amount of psittacin. We too have seriously considered this possibility.
However, Raman spectroscopy studies of feathers from proven blue1 and blue2 Agapornis fischeri and Agapornis personatus did not provide evidence for the presence of psittacin. We published the results of this test in the BVA-International journal from December 2020.
So there is no visual difference between blue1 and blue2 in Agapornis spp