The real story
In batik tulis, the maker fills a canting with hot wax and draws on cotton, gently blowing on the spout so the wax flows evenly. The wax resists the dye: dip the cloth, and the waxed lines stay pale. For several colours, the cloth is waxed, dyed and dried again and again, and at the end it is boiled so the wax melts away (called 'nglorod'). Stamped batik, using copper blocks called 'cap', came later and is much faster.
Some motifs carried rules. Certain parang patterns, for example, were once reserved for the royal courts of Yogyakarta and Surakarta. On 2 October 2009, UNESCO inscribed Indonesian batik on its list of the Intangible Cultural Heritage of Humanity, and Indonesia made 2 October National Batik Day. Offices and schools across the country wear batik on that day.