Unlike other methods of reproduction, in which an artificial light source is used on a mass-production basis, the glass negatives have been exposed individually to direct sunlight on printing-out paper, resulting in miniscule differences among the prints. Depending on the density of the negative and the strength of the sun, exposure times varied between five minutes and two hours. Each print was then toned in a gold chloride solution. This step determined the final color of the image. To insure the permanence of the image, the print was fixed in two separate sodium thiosulfate baths after toning, and finally the print was placed in a water bath. The dried prints were then mounted using archival materials. Great care has been taken to produce prints that would have resembled closely those that one might have purchased while journeying through Egypt in the nineteenth century.

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