For my local Landings 2018: Developing Constructs Exhibition I have decided on a Chalk White Textured mount board with a black core. I am pleased with the results and think the black core gives the images some definition and provides a barrier between the print and the board.
Moving forward, I am considering altering the aperture design to preserve edge detail by mounting the print with a border between the edge of the print and the mount board of about a centimetre like this Salgado print:
Professional framers seem to prefer this approach and I believe this will give a visual stop to the eye movement as it scans the print and for the same reason I have elected for black frames for my Exhibition, again to help constrain eye movement, particularly in an informal exhibition space. Unfortunately, the standard-built 40 x 50 frames come with a poor quality plastic “glass” which gives an unpleasant reflection and refraction. I therefore intend to remove these from the frames and exhibit with the frames unglazed.

I agree. I’ve stopped using glass or plastic in the frames. If you print your own you can always repalce if they damaged or dirty! Too many distracting reflections unless you have completely diffuse exhibition lightoing. Looking forward to seeing the black core white amount and I think a 5mm perimeter strip of the basic paper (white) often works to good effect.