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How do you measure IPT?
Ned Goodwin, Global Dining, Tokyo:
There has been a great deal of mention of IPT per 2005 Bordeaux in particular. Is this measured by some sort of tannin assay, atomic spectrometry or some other ‘ometry?
David Bird MW, David Bird Quality Assurance ( www.dbqa.com ):
IPT has been around for a long time, known as Total Phenolics or Total Polyphenols. It is determined very simply with a spectrophotometer by measuring the absorbance of the wine at a wavelength of 280nm. As you say, it is a somewhat fashionable parameter in Bordeaux at present, but it does not have much significance, as...
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