Rx-Site allows users to select the material as a combination of material, tint and pretreatment in Rx-Universe, as follows:
Labs have the ability to customize the description shown for each combination of material, tint and pretreatment. From the main menu, select "Remote", then "Rx-Site Material Descriptions".
The "Export to Rx-Site" option creates this file, and it will show all of the combinations of material, tint and pretreatment, using the descriptions from each piece:
The lab can change any of the specific descriptions by double-clicking on one, and then modifying the description as desired: