Jump to content
IGNORED

Bean mass too low after roasting


Recommended Posts

Hi all, 

I have just purchased a new Kaldi Mini roaster to learn how to roast coffee. 

I started with 200g green beans (Guatamala Washed), and roasted it through 11 mins whilst taking down the temperatures at each minute, recorded charge temp, first crack, etc. I have done this about three times and still the same result.

The main issue is, that somehow I have managed to almost halve the mass of the beans (200g->120g), and cannot seem to understand why? I have read that usually the expected loss of mass due to water is 12-25 percent, and for some reason my weight loss has been approx 40-50 percent... I did not burn the beans (or at least I don't think so), and the roasts were on the medium to dark side.

I am completely new to this, but really want to learn how to roast a good batch. If there is a glaringly obvious mistake, I will be very happy to learn it.

PS. first post, hi guys!

Link to post
Share on other sites

I don't think that the loss of mass is a problem, if the beans taste good after a few days of degassing then everything is ok. Perhaps the beans have a high moisture content to start with. You could try some different beans and see how they compare or roast another batch a bit lighter and compare these results too. At the end of the day a good tasting coffee is the result that matters, if you have that then it doesn't really matter how you got there.

Link to post
Share on other sites
28 minutes ago, alanmason said:

I don't think that the loss of mass is a problem, if the beans taste good after a few days of degassing then everything is ok. Perhaps the beans have a high moisture content to start with. You could try some different beans and see how they compare or roast another batch a bit lighter and compare these results too. At the end of the day a good tasting coffee is the result that matters, if you have that then it doesn't really matter how you got there.

High moisture content can cause mould to develop on the green coffee so it is a problem. It will also affect the taste and roast significantly (not just if it goes mouldy). And of course aside from all that when you buy 10kg of green coffee you expect to get at least 8kg roasted from it, not 5-6 so there's the cost to consider. 

Link to post
Share on other sites

thanks for all the replies. interesting, i will try a different type of green bean and will report back. i did have a suspicion that it could have had something to do with the moisture content as otherwise that much loss of mass through chemical breakdown would imply charcoal. 

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • About
    Coffee Forums UK is the UK's premier coffee forum Started in June 2008 by Glenn Watson, we now have more than 24000 mainly UK based members, and welcome more than 3000 members and visitors from around the world each day! With strategic investment and digital expertise from the Jackson Lockhart team (Tait Pollack and Adam Bateman), we are taking Coffee Forums UK to the next level, and are delighted to share the journey with you.

    New Members:
    We are often referred to as the friendliest forum on the web and we look forward to welcoming you onboard. Please read our Terms of Use. We stick by them, existing members please familiarise yourselves with them.


    Advertising

    Coffee Forums Media Kit

    Click Here To Buy Advertising Space 
    £100 p/m when paid yearly, up-to: 690000 banner impressions per month!


    Donate / Sponsor

    Get Your Supporter Badge Today (per year)

    image.png



    Coffee Forums Logo
     

×
×
  • Create New...