tree, along with several non-ficus species such as Morus celtidifolia, Citrus aurantifolia and Heliocarpos donnell-smithii. However, the taxonomical identification of trees used for amate paper production is not exact, leading estimates of wild supplies to be inaccurate. The softer inner bark is preferred but other parts are used as well. Outer bark and bark from ficus trees tend to make darker paper and inner bark and mulberry bark tends to make lighter paper. Bark is best cut in the spring when it is new, which does less damage. It also is less damaging to take bark from older ficus trees as this bark tends to peel off more easily. The commercialization of the product has meant that a wider range of area needs to be searched for appropriate trees. This has specialized the harvesting of bark to mostly people from outside San Pablito, with only a few paper makers harvesting their own bark. These bark collectors generally come to the village at the end of the week, but numbers of harvesters and amount of bark can vary greatly, depending on the time of year and other factors. The paper makers generally buy the bark fresh then dry it for storage. After drying, the bark can be conserved for about a year. From the beginning of commercialization, the making of a paper brought in most of the village's population into the process in one way or another. However, in the 1980s, many men in the area began to leave as migrant workers, mostly to the United States, sending remittances home. This then became the main source of income to San Pablito, and made paper making not only secondary, but mostly done by women. The basic equipment used are stones to beat the fibers, wooden boards, and pans to boil the bark. All of these come from sources outside San Pablito. The stones come from Tlaxcala. The boards come from the two nearby villages of Zoyotla and Honey and the boiling pans are obtained by local hardware stores from Tulancingo. In the pre-Hispanic period, the bark was first soaked for a day or more to soften it before it was worked. An innovation documented from at least the 20th century is to boil the bark instead, which is faster. To shorten the boiling time, ashes or lime were introduced into the water, later replaced by industrial caustic soda. With the last ingredient,