The marketing hook for this is taking people's photo with a ULF camera. You are selling an experience and that is the crucial part of it, not any of the method that happens behind closed doors. I don't think any clients will know or care about the difference between a platinum or selenium toned silver print. Both will last 100 years + so you'll be long dead before there are any issues with either.
The only portrait photographer who's model I would recommend studying is Bradford Rowley https://www.bradfordportraits.com/
He has a facebook group called 'the gold group' that gives a lot of information on how to create a high level experience.
Not because his work is good, because it really isn't, but because he has developed a model that seems to take lots of money out of rich people's pockets very effectively.
First lesson - most clients don't really know genuinely good work from a hole in the ground.
Second lesson: Create a product that adds value from the typical portrait experience. In his case digital portraits printed onto canvas and the over painted with oils, I actively hate his work but it seems to sell.
Third lesson just look at how awful this work is https://www.bradfordportraits.com/copy-of-dress-code but it full of signifiers of wealth and status. If you want to run a successful portrait business there is a lot to learn from this approach.
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