Dear L.Finch: Recording watermarks is for most of us a matter of budget. Since I am not in the rank of betarays or similar, I had to look for a more unexpensive procedure. My son helped me in developing it. I use a special portable screen(Cold Cathod Fluorescent tube backlight; weight 400 grams;measurements:205x155x17 milimeters) and a digital camera. I than store the picture into the computer, enhance the image and try to compare it with existing watermarks archives and other sources(Not al- ways with success). An even less expensive way and useful in case that the document cannot be lightened from underneath, is to make a rubber- copy, using tracing paper and a very soft pencil(5B to 7B),and fixing the image with a spray. This procedure has to be practiced previously to avoid any damage to the documents. The spraying has to be done out- side the storing area of the documents. Such reproduction can be easily filed together with the reference and data sheet. Both procedures have the advantage to reproduce the watermarks in the exact shape. Manufacturing of color paper in 1750 is well described in La Lande "The art of making paper" I have only a fascimile (1968) of the spanish translation dated 1778, which is easily available. On the other hand, since manufactured color paper was usually a low grade product, most do not show watermarks or only initials. A good reference of the subject colorpaper, including identification procedures, can be found in: Weiss Karl Theodor "Handbuch der Wasserzeichenkunde" Leipzig 1962,p.65 -68 and p.227 to 229.My best wishes in your research,Tomas Stohr.
Robert W. Allison
Dept. of Philosophy & Religion, Bates College and
Information Services, Bates College Lewiston, Maine, 04240