Prepare to Dye

First things first, you need to accept the quest. Head to the Manager’s Residence in Parm and speak with Reggie to take on the 'Prepare to Dye' side quest.

Now, it's time to gather your materials. You'll need three main things: a Rainbow Rubia, a Loess Stone, and 50 of each of the four base Sepith types (Fire, Water, Earth, and Wind).

To get the Rainbow Rubia, make your way to Saint-Arkh. Use Quick Travel to the Albion Garden Department Store and head to the Luxury Food Sterry Farm store within it. You can purchase the Rainbow Rubia there.

Next, you need to find the Loess Stone. Head to Old Agria Road. At the first fork in the path, take the left turn. At the next fork, take a right. You should find a yellow stone in this area – that's your Loess Stone!

If you still need Sepith, there's a Chest located on Old Agria Road itself that contains 50 of each of the four base Sepith types. Grab those if you haven't already.

Once you have all the required items – the Rainbow Rubia, the Loess Stone, and the Sepith – return to Reggie in Parm. Hand over the ingredients to complete the quest.