How to Colour Fondant using FONDUST

What is FONDUST®?
FONDUST® is a fantastic colouring product
for pastry chefs! It is the only water-soluble
colour that can be used directly in food.
Easy to use, FONDUST® is a microencapsulated food colouring especially designed for colouring food with very low water content. It can be used to colour fondant, sugar work (before or after baking), almond paste, royal icing, buttercream, cake mix, macaroons, decorating gel, candy, etc. Practically everything . . . except pure chocolate. The collection is made up of 36 colours. With FONDUST®, you can achieve very dark colours, like black, red, blue and brown, as well as very bright colours, such as orange, green, pink and violet.
Advantages
Highly concentrated colour
Immediate colouring
Does not change food consistency
UV-resistant colours
Edible
Find Fondust on my website here: emmassweets.ca...
Soundtrack from UA-cam Library: Clover 3 Vibe Mountain

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I am using Maroon Roxy & RIch to create a harry potter cake. I have used almost 1 tsp of colour so far and it is still more brown than a nice maroon. How much Fondust do I need for 40 oz of Fondant?