There are two well-supplied labs capable of still doing dye transfer printing for you, one in this country (possibly nearing retirement?) and another still quite active in Germany, and both using novel modernized techniques. But anything like this is inherently quite expensive. Outright buying matrix film is getting quite difficult because the remaining commercial operations need their own dedicated stockpiles of it. A few individuals are contemplating small-batch coating machines of their own. But the odds of some philanthropist coming up with the whopping sum of money needed for another industrial scale coating of matrix film and pre-mordanted receiver paper appears doubtful. The last time that was done was thanks to a major university grant in Germany. Otherwise, mordanting your own paper and securing your own dyes is relatively easy. But you'll still need a lot of time and a lot of space compared to most other color printing options.
As far as RA4 reversal goes, yeah, a number of people are experimenting; but results so far are kinda "creative" more than repro quality, and the relative permanence of such prints, or lack thereof, is still an unknown.
And cost-wise, making high-quality LF internegs is getting pricey too. For example, if you're intending to shoot 8x10 chromes at now at least $35 per shot with processing, double that for the C41 contact internegative, plus one or more sheets of TMax 100 masking film ... easily adds up to around $100 per image before you even begin printing. That's not really terrible if you're highly selective about what you choose to print, but factoring a number of inevitable bellyflops in route, during the learning curve, it all adds up. The alternative of just shooting color neg film in the first place instead, is obviously both significantly cheaper and requires far less time and fuss, but does not necessarily alleviate the need for supplemental masking in certain cases for optimal results.
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