30ml alcohol ink in soft blue for fluid painting, epoxy resin, resin art and mixed media projects. Octopus Fluids alcohol ink in the color OPAK CARIBIC is an opaque and fast-drying alcohol-based paint. The colors of the Octopus Fluids series OPAK have been specially developed for use on dark surfaces. Delicate pastel effects can be achieved on white or transparent surfaces and can be mixed with each other as well as together with our transparent alcohol ink paints. The opaque pastels are also suitable for realistic painting. Our alcohol inks can be used on almost all smooth, non-porous materials. Synthetic papers (such as Yupo paper), glass, metal, ceramic, porcelain, stone are best suited — the possible uses of Octopus Fluids alcohol ink are almost limitless.