When creating Soda Ash, my inventory had 48 normal Limestone and 12 Limestone +1. When I clicked on the '+' to increase the use of the Limestone +1, the Focus did not increase. It did increase if I use the +1 version of Oil of Vitriol (MW1 variety).
This may be true for all new 71+ materials, I have not verified, but it definitely is broken for Limestone.
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I say appropriate rather than none, because if I already have some focus, and add all 3 x Limestone+, there is a 1% change to the focus on the last one (this does not happen with Brimstone). I am assuming they have set the +focus too low - a bit hard to judge, as none of the + versions actually change the Focus amount shown - they just change the %.
Might is not always right - the powerful sometimes forget that.
The Small Band