This Bachmann model is a N/HO/00/O Gauge WC1218 Stone Grey Earth Colours™ Liquid Pigment 4 fl. oz. from the Woodland Scenics Accessories range of models. It has been specially formulated for adding color to Plaster Cloth, Flex Paste, foam, wood, plaster and papier mache terrain models. The product is non-toxic, water-soluble, removable and you can create your own custom colors by mixing the range together to get the perfect finish.