Does colour affect gravity?

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simple one
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Does colour affect gravity?

Post by simple one » Sun Apr 26, 2009 11:44 pm

Does colour affect gravity? :D

I always assumed it does. But now I am less sure. I always thought that a dark malts/grains which have a poor convertion (or none at all) to sugars would leave a compound in the brew which would factor in the gravity.... meaning the FG would be higher. I could test it out by boiling up some chocolate malt and measuring the gravity once its cooled, but thats a bit of a waste. So instead I put 5kg of black malt in to Beer Engine. I expected around a SG of around 1020 because I though the malt would be so burnt that it wouldnt convert easily and a FG of around 1015 because there is little sugars to ferment and the rest of the compounds would just be colour and burnt starch. But it gave a beer which starts at 1043 and finishes at 0991. I dont get this at all.

Have I got it completely the wrong way around?

boingy

Re: Does colour affect gravity?

Post by boingy » Sun Apr 26, 2009 11:58 pm

Different grains have different potential extracts.
It's not related to colour as such, although you are correct that some of the darker grains tend to have a lower extract potential.

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simple one
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Re: Does colour affect gravity?

Post by simple one » Mon Apr 27, 2009 6:59 am

Infact I think black malt is coming through on my beer engine as 100% fermentable rather than 0%

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