Gr, Your wife is correct about the Glucose to Sucrose sugars, But, I like the Dextrins, especially Maltodextrin, which is a shortchain starch sugar, gelatin hybrid base, that is mostly Un-fermentable, and Give body to my Browns, Porters, and Stouts.

To clear Finished beer a 9-12um filter can remove all yeast, and leave the beer clear and keep the body.
To clear wort 25um or larger filter will make nearly cystal clear wort that will still contain body, which is the size of 400 thread per inch bed sheet.

So, if you really want really clear wort, use a bag made from a white poly/cotton bedsheet, and spend a few hours draining it.

Or a coarse bag that drains quicky, leaves muddy wort, a lot of trub, and very little off flavors.

Time is the thing that you need to consider....4 hour mash and overnight draining????????

Don’t worry Joshua, just talking about removing dextrins from the testing sample to allow accurate analysis of fermentable sugars.

I wouldn’t dare remove the dextrins from your browns, porters and stouts. They sound too damn delicious! Nice choice of beers! I think that’s the direction I’ll be going in when I move on from SMaSH IPA’s.

What’s the aim of measuring specific gravities? Is it to provide a measurement of non-fermentable dextrins and fermentable sugars combined? What’s the purpose of taking that measurement, other than for a rough guide? It tells you neither how much sugar you have nor how much body you have, but lumps the two together in one measurement. Do I not understand this?

If you could take the normal combined SG measurement and then filter out the dextrins, proteins and other body forming compounds, then you would accurately be able to measure fermentable sugars. Using both of those measurements, it should then be possible to calculate the amount of body producing compounds. Thus for a brown ale you would be able to separately estimate the body AND the fermentable sugars. Wouldn’t that be of greater value? Again…do I not understand something?

GR, This may Piss off PP, but the EIK or EIF don't matter to me since the Specific Gravity that I plan is +_2% at pitching temperture.

That is all I need, since "Numbers is just Numbers"

And I wouldn’t mind betting your browns, porters and stouts are delicious!

I absolutely agree, it may not be relevant to making great beer, but it may have relevance to predictable programming. I’m not a programmer, so I don’t know.

Maybe I experienced some stratification, dunno, maybe only by 2 points though.

I should be more like BOND, JAMES BOND,... shaken, not stirred.

My gravity sample method is shown in my 3/16/2013 photos, taking a very small test tube sample or a 100 ml sample from said bucket should have been the same.

My sample yielded an OG of 1.074, whereas my BIABacus shows it should have been a 1.072.

I posted this yesterday;
http://biabrewer.info/viewtopic.php?f=5 ... 150#p29469

I'm coming in on this way late. However, when I first read the OP, I thought.. did he rinse the pipette and take sample #2, rinse and take #3, etc.?? If so, the tiny volume could well be corrupted by the droplets of water remaining in the pipette. However, if different pipettes were used.. scratch my theory :D

mad scientist - I don't know why your dead guy clone was so different, and this study i did still doesn't have a conclusion (yet). Maybe you could account for some of your discrepancy with stratification?

I still have the samples available, & I am thinking i could try heating them up (covered to avoid evaporation), then doing the same measurements again to see if there is any effect from the sample temperature (& allowing them to cool).

HbgBill - It is a fair question, but I used the same pipette for each sample. The pipette is, however, rinsed about 5 times (tipped & shaken each time to rinse out the previous "contamination" which may have even dried somewhat). The rinsed sample is either discarded (study) or squirted back in the kettle (brewday).
In fact I used the same technique when I did the refractometer calibration study, & this shows no problems with the technique (the gravity matched the "intended").

I like your thought process though, if I could attribute it to something like that, it would make life easier!

Yes, with such small samples, it doesn't take much to through it off.. That's the best my mind can do w/o being there