The oldest color available in a batik piece is blue. This was made, in the olden days, by mixing indigo leaves with molasses. The molasses acts as a binding agent so that the color comes out and stays on the fabric. Lime juices were added too, and the solution would be mixed up well. This sticky liquid is left to cure overnight, or at least for eight hours.
Batik is very simply a kind of tie-dying technique that has been around for a long time. The fabrics are covered in a wax that holds off the dye. When the fabric is dyed, anything under the wax retains its original color - whether that’s the original color of the fabric or one of the dyes.