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Color shades have several different causes. The printer may use a different ink; in the early days, inks were made up in batches as needed, and were rarely consistent. In such cases, the shade provides information about when the stamp was made, and possibly even identify a particular printing.
Foxing is an age-related process of deterioration that causes spots and browning on old paper documents such as books, postage stamps, old paper money and certificates. The name may be a variant form of the English West country dialect term foust and Scots foze , to become moldy. [ 1 ]
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Invert error: Part of the stamp is printed upside-down. Inverted overprint: The overprint on the stamp is printed upside-down. Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended.
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To print an intaglio plate, ink or inks are painted, wiped and/or dabbed into the recessed lines (such as with brushes/rubber gloves/rollers). The plate is then rubbed with tarlatan cloth to remove most of its waste (surface ink) and a final smooth wipe is often done with newspaper or old public phone book pages, leaving it in the incisions.
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Initially, the ink used was red, but it was found that this could be cleaned off and the stamps reused, and so after a series of experiments, early in 1841 black cancelling ink was used, which was more permanent. The color of the stamps was also changed to red-brown so as to ensure that the cancellation showed clearly. [3]