I've never tried KRST stronger than 1+9 with MGIV FB but now I'm curious. MGIV FB is fairly resistant to pronounced colour shifts compared to some other papers (Oriental VCFB for example), but I'm thinking a test is in order. I'd like to measure the reflection densities also to try to quantify the d-max increase.

My understanding is Harman Selenium is very similar to, if not virtually the same as KRST.