At tailoring skill of 197 I got the message "You lack the knowledge to work with this material."
Edit~apparently you need to do a quest to be "taught" the process to do this combine.
Alternatively you can turn in the Etched Scales to someone in Abysmal Sea for the Preserved Etched Scales.
Giving muramite etched scales to Tonlyei Lyhin, yields preserved muramite etched scales
Giving aged muramite etched scales to Garald Samer, yields preserved aged muramite etched scales
Edited, Wed Jun 23 03:05:46 2004