Did you smack them on the back of the head? People who do that deserve the smack.
Actually ...... (as my niece was want to say when she was 6)
Until I discovered APUG and other internet resources, I had very little exposure to most of the historical processes. I have no problem with Instagram emulating cyanotypes - I just wish it gave credit for where the ideas for most of the "filters" originated.
Thats awesome :D I was thinking of doing some nice cyanotype prints and frame them for small gifts but Christmas cards are such a cool idea, it also works well due to blue being a 'cooler' colour which would work well with a winter photo.