FWIW I did my own test as per above. aA bit different results-there must be batch differences. I found the Staedler Pigment Liner and Faber Ecco most opaque so I started labeling a project. I slightly preferred the ECCO and started with that. However in actual use the Ecco dried out quickly between labeling negatives even with the cap on as I was labeling them and then scanning them (on a run of 65 negs). It was a huge PITA and after 10 negs I pitched the ECCO in the trash and finished the rest without problem with the Staedler Pigment Liner. I just ordered some more of the Staedler's to keep in reserve.
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