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In page Dutch Formosa:

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Some Dutch physical characteristics such as auburn and red hair among people in regions of south Taiwan are a consequence of this episode of Dutch women becoming concubines to the Chinese commanders.[9] The Dutch women who were taken as slave concubines and wives were never freed. In 1684 some were reported to be living in captivity.[10] A Dutch merchant in Quemoy was contacted with an arrangement, proposed by a son of Koxinga's, to release the prisoners, but it came to nothing.[10]