There is no such thing as a 'blue' phal. in nature. There is no other possibility than that they were artificially colored. No self-respecting orchid enthusiast would be fooled by them (nor would be stupid enough to purchase one) Even
my Vanda coerulea is not a true blue color (but pretty close). The only orchids I ever saw that approached a true blue color were a few in the thelemytra genus that grows primarily in Australia.
Thelemytra ixioides Thelemytra venosa Thelemytra erosa Thelemytra nuda