Re: Masa examples from Rajul
I prefer the rough side images, mostly because on my monitor the smooth side ones are a little biased towars a green/blue cast. This does not mean that one could properly balance it better, as this is only a comparison about the behaviour to equal treatments.
What cannot be appreciated from the pictures is the texture of the surface. This is a matter of personal taste choosing the working side, which might be more important than its behaviour.
As promised, Rajul has sent some gum and gum/cyanotype images on Masa: