Eh, Nick. Your remarks about Salto just made me curious because I hadn't ever heard of them before. Trying to look it up on the internet, turned up not a lot to say the least. They don't seem to have a website (anymore?), and I could only find a reference to their former location being sold in 2006:
So, are they still alive and where to contact them?
To the best of my knowledge Salto Drukkereij was using offset printing to emulate platinum prints. To enhance the tonal range of bw/ sepia images, printers often use additional colours to enhance contrast and tonal range. If done properly, offset can deliver results that can look even more spectacular than continuous tone images. This is why many mistake such output for large format platinum prints.