Mulig du har rett. Det er denne atikkelen fra BYO som jeg har sukkerteorien fra:
http://byo.com/mead/item/147-arent-...you-boil-part-of-your-mash-during-a-decoction
Relevant utdrag: "A decoction mash is different. Thick portions of mash are removed and boiled. The wort in mash is very concentrated, usually about 18–22 ºPlato. This means that the concentration of sugar is high. It also implies that the wort protein content is high as well since there have been no steps taken to remove protein from the wort, for example wort boiling and trub separation. During the mash boil in a decoction mash, protein from the malt reacts with tannins and precipitate. The pH is also “normal” (~5.2) at this point in time and the solubility of tannins is still relatively low compared to that seen in the last runnings from the lauter tun. I admit that the following statement is an educated guess but I would venture to bet that the reaction between protein and polyphenols is significant and explains why decocted beers are not overly astringent."
Forfatteren refererer også til slutt fra et møte med en tysk bryggeriekspert som sier at det faktisk skjer tanninekstraksjon under dekoksjon
. Jeg tror definitivt ikke det bør bekymre trådstarter.