The workers collecting and transporting sulphur from the fuming mouth of the Ijen volcano in, Eastern Java, Indonesia – up the rocky trail out of the crater and down to the road-head – live lives that are both tough and dangerous. Once the substance destined for industry is condensed out of pipes into lurid yellow lumps, pairs of baskets weighing at least 80kg are carried out several kilometers on the men's shoulders, causing large callouses and other physical injuries. All the while, they must counter the acid fumes billowing all around and are at risk of crater explosions that sometimes occur.