 The knowledge was integrated with magic and a special bag of magical ingredients was passed from father to son.The Twa chiefs of the Wafipa, any of his family, and all women were forbidden to visit the site of a kiln or forge, while all other visitors had to acknowledge the smith's authority with a payment.The smith and his assistants were supposed to abstain from sexual intercourse, for the smelting and forging of ironwork was a very specialized craft totally bound up with knowledge and magic, using very particular ingredients from doctors and sorcerers.