That is not color floating to the top. Tint Base is exactly that. It is paint in itself that is poured into the container at a certain ratio, to get the proper color. If it is Latex, it is the chemical to allow it to dry properly and also to keep the paint from developing mold when it sits in the container. If it is Oil, it is the actual Linseed oil and same as Latex, a Fungicide to keep the paint from spoiling.
You do realize that you can get paint re-tinted. It is just that it cannot be any older than two years.
You do realize that you can get paint re-tinted. It is just that it cannot be any older than two years.