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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
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Soren Sorensen. Portrait of Danish biochemist and inventor, Soren Sorensen (1868-1939). He studied chemistry at Copenhagen. From 1901 he held the... more
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Soren Sorensen. Portrait of Danish biochemist and inventor, Soren Sorensen (1868-1939). He studied chemistry at Copenhagen. From 1901 he held the Directorship of the Carlsberg Laboratory. Sorensen worked on amino acids, proteins and enzymes. In 1909 he invented the pH scale as a measure of acidity, for which he became famous. This scale is rigorous enough for both chemists and non-chemists alike, and is universally employed. For any solution, a pH from 1 to 7 indicates decreasing acidity; 7 to 14 shows increasing alkalinity; while pH 7 is neutral at 25 degrees Celsius. The value can be measured with a pH meter or with pH indicator paper.
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