This subquest is located just south of Draynor Village Bank. Talk to the witch to start it. No items are required.
The witch you are looking for is Wendy, she is near the crafting guild.
Purple cats can't be reversed. Other cats can be obtained from Gertrude' more info: Link below
The Purple Cats are accessed by a mini-quest that you unlock after Swept Away and Gertrude's Cat. Purple cats can be created when you bring Wendy the Magic Unguent.
Hell-Rats are found in Evil Dave's basement in Edgeville and can only be accessed after starting the Evil Dave subquest in Recipe for Disaster.
Depends what your talking about... Purple cat?
You can get them at Canfis
You get a cat from the quest "Gertrude's Cat" and you can buy a cat after you complete it.
top cat
If you die a cat it can be purple!
At the barber shop in Falador.
only if its the cheshire cat
you need to be a member first of all to get a cat