This Practitioner's Processing Mask has been painted with Zepheniah's Greed so it costs 7.99 ref. Negotiations are available if I'm online after 11:30 PM, but preferably after 3 PM.
My trade offer link:
Practitioner's Processing Mask on backpack.tf:
Zepheniah's Greed on backpack.tf:
For the cost of the item, this told me to add 1/2 the price of the paint to the original item: