Digital BW, The Print

Back in May I received an inkset from MIS. The order was for a UTFSN inkset to suit an Epson 2000P.

According to the data published on the site, there are only 4 inks in this set, fitted to the printer as C M C M Y.

But this set does have 6 different grays. As a quick test I used a cotton bud to put 6 swabs on some paper. Scanned and measured in Photoshop, the L values are:

UTFSN-K   28
  "   C   40
  "   M   38
  "   Y   70
  "   LC  52
  "   LM  63

The photo black bottle is labelled UT-HEX-4-PK

Is this a UT-HEX, Eboni-6, UT2 or other inkset?

Cheers
Greg