I can only speak from theory, Svend i.e. what I have read so take it with a pinch of salt but I have seen half a grade claimed for selenium and a whole grade claimed for chromium.
If you are a selenium user and have the stuff then it sounds worth using. On the other hand, if you only have one or two negs to rescue then chromium intensifier is cheaper in the U.K. than the smallest commercial selenium pack I can find and allegedly might produce more contrast.
Mike
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