sulfate
salt. Bosse's other two acids are distilled pure vinegar (acetic acid)
and a boiled mixture of vinegar and chloride salts. Both are relatively
weak. My thanks to Dr. Robert P. Multhauf for his advice on 17th-century
chemistry.

[32] +Felix Brunner+ (_A Handbook of Graphic Reproduction
Processes_, New York: Hastings House, 1962, p. 124), suggests that
Rembrandt may have used ferric chloride, a weaker mordant, around 1640.

[33] +Rosenberg+, _Rembrandt: Life and Work_ (London: Phaidon
Press, rev. ed., 1964), p. 330.

[34] My gratitude to Jacob Kainen for first pointing out the
existence of these disembodied spirits.

[35] Arnold Houbraken, quoted in +Hofstede de Groot+, _Die
Urkunden_ ..., op. cit., no. 407, p. 471.

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