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Copper Plate Photogravure by Marlene MacCallum, David Morrish

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Appendices

APPENDIX A—SAFETY CONSIDERATIONS

One of the misconceptions about photogravure is that it is a dangerous process. Like many photographic and printmaking processes, the materials used for photogravure are safe when handled properly. However, a few components of the process require additional caution when working with them. In particular, dichromate powder, asphaltum powder, and ferric chloride powder can cause serious injury or, in the case of dichromates, can be fatal through a one-time acute exposure. Potassium dichromate is the only one of the three that must always be used in the photogravure process. Extreme care must be taken at all times when working with any powder. When a dichromate salt is in solution airborne risk is minimal, ...

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