The first thing printed is the name of the watercolour paint, followed by 4 different properties of the paint.
The first bubble has a ✔️ which signifies a lightfast pigment. If the lightfastness rating is less than 5 (excellent lightfastness) then it will have the number it ranks instead. The second slot is the opacity. It will be one of 4 options O for opaque, SO for semi-opaque, T for transparent or ST for semi-transparent.
The third slot indicates if the paint is a single pigment shown as S or an exclusive Ruco blend of pigments signified by B. The final slot tells you if the paint is granulating, flat or a shimmer (or a combo of them). G for granulating, F for flat, S for shimmer and then G/S for a granulating paint with a shimmery component.
Please note, information is as accurate as possible based on the pigment information provided by suppliers.