Re: Rehydrating beans - any experience?
Posted: Sun 20 Feb, 2022 12:03 pm
I have worked a lot with the rehydrated beans. I didn't have more of the Guatemala Asoproguate washed 2019 but I had a Guatemala Antigua washed 2021 that is rather similar. When I measured moisture it was rather similar maybe a little more moisture. The moisture is around 11.5% to 11.8%. I have used 95g beans and 5g H2O sometimes a few 1/10th of grams more. The batch moisture has been around 16.5%.
I've had some problems to get the developing phase ROR right and there were a tendency to a crash and flick at the end. I thought the PID-logic overreacted so I tried a power zone at the end of the roast. After many iterations the ROR looked rather ok but it didn't taste ok. There were a bitter aftertaste that I think you could call "baked" even if the ROR didn't look so bad. So I went back to the PID-control. I've found out that what's happening before 1st crack very much affects what's happening during the developing phase. If you have too much heat before that phase there is a risk for a crash and a flick. Now with my last roast I had less boost before 1C but continued during developing (during the cracking phase when the beans give away a lot of moisture) and started the negative phase 3 later when the beans go exothermic. This is the last log:
L became 1.2 and it is a light roast but not very light (the lightest I've made is 0.99-1.0). I stopped the roast at DTR 20.5% but I could have stopped it earlier to get a lighter roast. I always cut the beans in halves to see if they are evenly roasted inside and it was (as it seems to always be with this profile). The original D-Light profile from Damian has a very high fan speed. I have lowered it a little in the beginning and more at the end to lower the power demand. The fan speed is still high compared to most other profiles though. It's not possible to see in the log as there is no scale. The max needed power is moderate at 1.38 kW. I think the ROR looks nice!
I haven't tasted this roast yet. I have tasted the other roasts. I haven't made a cupping session as I'm "Post Covid" and I can't taste the finer nuances. I have instead made brews with the best drip coffee method I have and I can taste if the brew has a nice and balanced acidity and sweetness. I'm sensitive for bitter taste. I have mostly enjoyed the lighter rehydrated roasts. The lightest roasts have been with rehydrated beans. The beans that haven't been rehydrated tend to become more medium light with a L around 1.7 at the same DTR around 20%-21%.They were more bitter but not uncomfortable. They tasted quite ok but wasn't as clean and balanced as the rehydrated lighter roasts in my opinion. Rehydrated beans come out lighter at the same DTR. More hot steam make the roast more efficient.
This is the latest incarnation of my modified profile:
If you try it you may have to modify it for your bean. I think it can work well also for non rehydrated beans. The default L is 2.0 and that is a good start to be able to mark the 1:st crack. I don't think you should go higher than that level. The very first single crack tends to come rather early with rehydrated beans. I wait until there come more in succession before I mark 1st crack. I'm using my mobile to record the cracks as a visual help: https://kaffelogic.com/community/viewto ... ?f=5&t=326.
I've had some problems to get the developing phase ROR right and there were a tendency to a crash and flick at the end. I thought the PID-logic overreacted so I tried a power zone at the end of the roast. After many iterations the ROR looked rather ok but it didn't taste ok. There were a bitter aftertaste that I think you could call "baked" even if the ROR didn't look so bad. So I went back to the PID-control. I've found out that what's happening before 1st crack very much affects what's happening during the developing phase. If you have too much heat before that phase there is a risk for a crash and a flick. Now with my last roast I had less boost before 1C but continued during developing (during the cracking phase when the beans give away a lot of moisture) and started the negative phase 3 later when the beans go exothermic. This is the last log:
L became 1.2 and it is a light roast but not very light (the lightest I've made is 0.99-1.0). I stopped the roast at DTR 20.5% but I could have stopped it earlier to get a lighter roast. I always cut the beans in halves to see if they are evenly roasted inside and it was (as it seems to always be with this profile). The original D-Light profile from Damian has a very high fan speed. I have lowered it a little in the beginning and more at the end to lower the power demand. The fan speed is still high compared to most other profiles though. It's not possible to see in the log as there is no scale. The max needed power is moderate at 1.38 kW. I think the ROR looks nice!
I haven't tasted this roast yet. I have tasted the other roasts. I haven't made a cupping session as I'm "Post Covid" and I can't taste the finer nuances. I have instead made brews with the best drip coffee method I have and I can taste if the brew has a nice and balanced acidity and sweetness. I'm sensitive for bitter taste. I have mostly enjoyed the lighter rehydrated roasts. The lightest roasts have been with rehydrated beans. The beans that haven't been rehydrated tend to become more medium light with a L around 1.7 at the same DTR around 20%-21%.They were more bitter but not uncomfortable. They tasted quite ok but wasn't as clean and balanced as the rehydrated lighter roasts in my opinion. Rehydrated beans come out lighter at the same DTR. More hot steam make the roast more efficient.
This is the latest incarnation of my modified profile:
If you try it you may have to modify it for your bean. I think it can work well also for non rehydrated beans. The default L is 2.0 and that is a good start to be able to mark the 1:st crack. I don't think you should go higher than that level. The very first single crack tends to come rather early with rehydrated beans. I wait until there come more in succession before I mark 1st crack. I'm using my mobile to record the cracks as a visual help: https://kaffelogic.com/community/viewto ... ?f=5&t=326.