Jar for Watercolours - 50 ml. A practical jar for watercolours. Left-over colours can be kept in the jar. The lid keeps the colours fresh for many days and they do not need to be tipped back or washed out. The jar is also suitable for glue, ink or Indian ink. Paint Jar with Lid - 6 pieces. 6 jars each 50 ml ( each 1.7 fl. Oz.), with lid.