From The LNR Book of Knowledge

Rewards: Jundak Skull

Start: A Bleached Jundak Skull (“Study Skull Closely”), [372,-1259], Mensix Mining Facility, Mustafar

Part 1: Collect Skull of an Ancient Jundak - Ancient Jundak [1264,1299]; Combat: Ancient Jundak (CL84 Elite)

Part 2: Bleach the Skull - Vat of Bleach [442,-1220] inside the Mensix Mining Facility; Radial menu: “Bleach Skull”

Part 3: Bleaching the Skull - Wait 10 seconds and then use the Vat of Bleach again to “Remove Skull from Vat”