https://steemit.com/filmphotography/@captainklaus/my-bus-in-original-paint-somewhere-in-bulgaria-dirty-largeformatphotography-lab-on-the-road

@captainklaus travels in his bus-photolab, developing films on the road or directly upon stone surfaces. Check out his process of applying emulsion directly on the walls or rocks and exposing it to projection of negatives under a huge dark tent - he described that in some of his older posts.