HomeRoast Digest


Topic: temperature for 1st crack. (2 msgs / 42 lines)
1) From: Bill
Hello list,
I'm curious about 1st crack temps.  I have noticed that some beans crack go
at 405, others as high as 415.  Josh's post on the roastmaster blog about
their sidamo lists a first crack of 415.
so, my question is this... what is the highest first crack temp you've seen,
and what's the lowest?
I haven't seen anything below 405, which I've seen on the Colombian
Antioquia and the Ethiopian Harar.
I've seen 415, which I saw today on a Panama of unknown provenance, and on
another that I can't remember.
comments?
bill
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com

2) From: Ken Mary
It all depends on your thermometer calibration, probe location, roaster 
type, bean moisture, ramp approaching first, and etc. My range for start of
first is 393 to 415 F using a standard profile in my drum roaster with bean
thermocouple. Kenyans seem to start at the lowest temperature, most other
beans at 400, aged or monsooned at the highest.
Faster ramps delay the start of first to higher temperatures. But this is
only because the probe reads the bean surface which is the highest
temperature. The crack is a function of the bean internal temperature which
cannot be measured.
--
----------
<Snip>
<Snip>
Homeroast mailing list
Homeroasthttp://lists.sweetmariascoffee.com/listinfo.cgi/homeroast-sweetmariascoffee.com


HomeRoast Digest