Hi,
Pink = wash aid for the top tank
Blue or Green = odour killer and dispersant for the waste tank
Depends on what use you intend to put the toilet to, and how often you empty the waste cassette.
If your toilet is only for the odd night time pee, and you only stay 3 or 4 nights before moving on - and empty the cassette before you leave - then a half dose of either the blue or green liquid in the waste tank is fine - and a half dose of the pink wash aid in the top tank.
If your toilet is going to see serious use, then a full dose of green or blue in the waste tank is necessary - and a full dose of pink in the top tank
And try to be reasonably accurate when measuring out the blue or green fluids into the waste tank.
Wear gloves when adding the pink, green or blue liquids to the tanks - these have very strong dyes and will dye skin very efficiently - as one guy in France found out to his cost when cycling across the camp ground with the cassette on his handlebars.
Robert