Have a look at the Ilford brochure here:
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https://www.fotomayr.de/webkat98/ilford_mg_handbuch/multigrade/multigrade.pdf
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It lists the Durst values for the single-filter method. However, the table below that gives Leitz’s own values using the two-filter method (for Ilford Multigrade in each case). So you should be able to try out the Durst values on the Foma data sheet.€
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Regards, Sven.€