Before "BUYING" a paint brush it would be a good idea to know what colours your pet can be painted.
Go here
RAINBOW POOL
to check the colours available for your pet's species. Choose your pet's species and then click the submit button and you will see all the colours that are available for that Pet.
When You have decided what colour you like. Check the Paint Brushes listed below and see if it is a colour you get from a Paint Brush. Not all colours come from Paint Brushes.


Dont buy a stone or a glass unless you are a collector, you can't paint your pet with them. They can be found with the shop wizard so can primary colours & invisible.




Starter Paint Brushes can't be traded or sold or given away!

There Are Other Things That You Can Do To Change The Colour Of Your Pet!
Morphing Potions - Transmogrification Potions & Magical Plushies will change your pet to a specific colour and species.
Chia Pops will change your Chia's appearance.
See
Unclouded's pet page for a very well done list of Potions, Plushies & Chia Pops
The Secret Lab Ray will change your pet in many random ways. Please note that I said RANDOM.
See
JustToClearThings Up's pet page for a very well done FAQ about the Lab Ray.

Flask of Rainbow Fountain Water
Using this item will cause a totally random colour change. It can be reeled on when you are fishing or purchased at the Trading Post or Auctions. People are asking 750K and up for it. That's a lot of NP for a one use item with a random outcome.