I would try Rollei Ortho 25 with yellow green filter XO in Rodinal 1+100 10min first 30 seconds, then every 30 seconds 5 seconds agitation.

Ansel Adams mentioned in "Natural light photography" that mountain photographs (and glaciers and snow) often lack atmosheric depth - orthochromatic materials enlighten blue values and add depth, whereas a yellow green filter darkens the sky so that clouds will be visible.

Rollei Ortho 25 is super sharp, a development in R09 / Rodinal 1+100 enforces sharpness and enhances shadows. The highlights would be quite crispy and brilliant, so it would be better not to expose too much.

I love Rollei Ortho 25 because there is a webshop here in Europe selling this material for 20 USD / 50 sheets 4x5 ... (arsimago)

Here's a photographer in Switzerland: https://www.flickr.com/photos/miloni...-nSqdgf-phbzGu

Regards