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Resumen:
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On July 1, 1988 a new International Sugar Scale will come into force. To avoid possible confusion between the old and new scales, sugar values on the new scale will be designated 'Z rather than °S. On the new International Sugar Scale the optical rotation of the 100 °Z point under standard conditions will be 40.777 ° and 34.626 °at the mercury green and sodium yellow wavelengths respectively (compared to values of 40.765 ° and 34.616 * on the scale currently in force). To convert values in 'S on the old scale to values in °Z on the new scale it is simply necessary to multiply the *5 value by the factor 0.99971, i.e. to reduce the °S value by 0.029 percent. This conversion factor applies also for quartz control plates. Coincidental with the new sugar scale coming into effect, the Commission has removed the optional 0.1 '5 deduction from raw sugar polarisation results when reporting analysis "according to an equivalent dry lead method".
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