
Originally Posted by
paulslund
...@Galena, sometimes there is always just a bit of the fine niter that can get through the filters.. I'm currently using the 5 micron Orlon filter with 2 prefilters and there always seems to be some very fine stuff that needs to settle.. I keep my jars in the oven set at 170 to avoid cooling down too fast and I waited until the syrup was down to 185 before running through the filters (into a semi-insulated coffee percolator that I use for pouring into jars). I may try the 1 micron filter next year (or if I run out of jars and need to freeze nearup for later processing). If your syrup is 186 I didn't think it would form more nitre even sitting on a well insulated surface.. unless it was actually higher than 190-195 perhaps.. have you calibrated your thermometer?
Paul, this is the first time ever that I have had nitre form once hotpacked, and the only thing I did differently was have the pot sitting directly on my wooden kitchen counter as opposed to staying on the burner or, as today, on a cooling rack placed next to that burner.
Yesterday, I poured off the clear syrup from each jar and left residual syrup and nitre in the bottoms, then collected all that together and filtered it through my ever-popular and actually pretty good coffee filter and clothespin setup :-)
Today I heated the jars at 190 for 10 min (probably even longer) then turned the heat off; residual heat in the oven would have kept them around 170 like you say. Meanwhile, I slowly reheated the syrup, which I kept covered overnight in the fridge, back UP to 185; the second my therm (a professional food-industry grade digital therm, a Taylor) read 185.4, I took it off the burner, put it on a heavy duty cooling rack and hotpacked again. No way is that therm off; I'm still willing to bet that that 2' thick slab of ash that is my countertops was responsible for retaining heat. Again, Maillard's reaction.
Just finished hotpacking again, will let you know in a couple hours. Meanwhile this exact same process has left me with 2 batches of perfectly clear hotpacked syrup, nitre free, safely stashed away.
ETA: Just checked and that syrup, along with the other 2 batches, is crystal clear. No nitre at all.
Last edited by Galena; 03-28-2022 at 12:12 PM.
Been tapping since 2008.
2018 - 17 taps/7 trees...819l sap, approx 28l syrup
2019 - 18 taps/8 trees...585l sap, 28l syrup...21:1 ratio
2020 - 18 taps/8 trees...890.04l sap...gave away about 170l, 30l snafu'd....23l total for me from approx 690l
2021 - 18 taps/8 trees...395l sap, 12 l syrup
2022 - 18 taps/8 trees....7 sugars 1 red due to #2 having surgery so had the season off....582l sap, 18.5l syrup
2023 - 18 taps/8 trees...all sugars again. 807l sap, so far approx 14l syrup