First is in the morning before the workers work incense process, second is before they have lunch, and third is after the workers wash their hands before having lunch. Only ten of thirty-five small household factories are collected samples for four times. Furthermore, the samples from the workers who use gloves are collected in the afternoon after the workers finish work. Moreover, dissolved dye and incense stick from the small household factories area lso collected to estimate heavy metal concentrations and to consider the mean difference between dissolved dye, dyeing color on incense stick, and dyeing color on workers’ hands. All samples are digested using microwave digester. The digested samples are measured for concentrations of six heavy metals that were barium (Ba), cadmium (Cd), chromium (Cr), manganese (Mn), nickel (Ni), and lead (Pb) by inductively coupled plasma optical emission spectrometry (ICP-OES).