A water based inkjet ink suitable for outdoor signage, with similar applications and lifetime to eco solvent inks. Currently supplied by HP, Mimaki and Ricoh. It contains resins (called co-polymers) and pigments held in an emulsion in water. Despite the name, it is nothing to do with latex rubber. Latex is the US term for what in the UK is called an emulsion paint, and latex ink is a similar idea to the latter.