I can't get my head around it to be honest. Red, yellow and green make up all the colours of the spectrum if you discount white, greys and black as not being a colour. Also the angle of light and other factors could influence the colour. I see orange pretty well if it is front lit, but when the sun is in front of me then it appears black. Maybe black & white bands are all we really need?
The Stonfo latex float tips are pre drilled and designed to retro fit existing floats. You can temporarily fit them on any float antenna up to around 3mm. They come in three colours and two sizes in the same packet. You should be able to paint them too. Also, modeller's paint can be retrospectivly painted on to shop bought floats and sealed using nail hardener. You could paint the float tips that you already have.