I had no idea there were original colour photos from the war. You often see images from this period re-coloured using modern image editing software or AI, but they never look convincing to me. These are fascinating.
He took 3 photos with different colour filters in succession and captured them on large glass plates. Naive alignment possible before digital technology limited the quality of results, but as original separate negatives survived - it was possible to scan them at high quality and properly align digitally. So now we can see those photos in true colour and high quality.
As one of examples a very vivid photo of Emir of Bukhara taken in 1911:
