[Homeroast] aluminum for roasting

Rich rich-mail at octoxol.com
Mon Apr 12 16:43:06 CDT 2010


Well, with stainless steel you should be worried about chromium.

Joseph Robertson wrote:
> Ryan,
> This thread in getting deep into some science I also have little or next to
> no experience with.
> Now to include the coffee and coffee making back into this thread, when I
> made coffee with the stove top Al. Italian espresso makers years ago, I
> always wondered if coffee or the acid nature of it durning the brewing
> process could in some or anyway leach some of the Aluminum from the pot? Now
> I use and promote stainless versions I don't think about this anymore.
> At least I wasn't till this thread started.
> ;) Joe
> On Mon, Apr 12, 2010 at 12:23 PM, Ryan M. Ward <silvercro_magnon at hotmail.com
>> wrote:
> 
>> I am not a medical person, and my chemistry background certainly does not
>> establish any sort of expertise. When I looked into the
>> Aluminium/Alzheimer's issue, the impression I got is that Aluminium,
>> although not the best thing for the body, does not enter the body easily.
>> The advice that I consistently saw not to cook highly acidic foods with
>> aluminium cookware(such as spaghetti sauce). I can tell you that the last
>> position that I read from the Alzheimer's association stated that the
>> hypothesis that Aluminum was a strong contributing factor leading to
>> Alzheimer's appeared unlikely. (Again, I am not a doctor and have NO
>> expertise on this, I am just a consumer passing along friendly information
>> that I have accumulated- please verify for yourself)
>>
>> Now, roasting-wise, what I would be concerned with is the "speed" at which
>> the metal heats up and cools down and how that plays into roasting
>> consistency. As I recall from memory, the specific heat of Aluminium is
>> pretty low which means that the your bowl will heat up quickly and cool down
>> quickly depending on the ambient temperature (Chemistry friends- please stop
>> me if I say something stupid). This is what I would consider.
>>
>> Now that I have commented on every technical subject that I am not an
>> expert in, do you have any numbers that need crunching?
>>
>> --
>> Ryan M. Ward
>>
>> *Note: This email was sent from a computer running Ubuntu Linux 9.10
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>>
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>>
>>
>>> Date: Mon, 12 Apr 2010 11:18:40 -0700
>>> From: theotherjo at gmail.com
>>> To: homeroast at lists.sweetmariascoffee.com
>>> Subject: Re: [Homeroast] aluminum for roasting
>>  >
>>>  I remember the, what I think was inconclusive studies on this.
>> Technically
>>> speaking I believe Al is considered a heavy metal even though it sounds
>> like
>>> an oxymoron. If the metal can enter my system through what ever method. I
>>> will steer around using it. Remember the stove top little espresso
>> makers?
>>> They used to be made only of Al. Now many from Italy are Stainless.
>>> Although the Al ones are still sold. I used to look down inside at the
>>> decaying Al that looked like an oxidizing mineral decaying soup. Never
>> will
>>> I go back to and consume any amount of that questionable stuff. Give me
>> good
>>> Ole cast iron or stainless.
>>> Nice for building some things not food related.
>>> Don't mind my rambling memories. Give me a good cup of Joe and who knows
>>> what I will ramble on about.????????????? ;)
>>> On Mon, Apr 12, 2010 at 9:16 AM, Tom Ulmer <tom at transtate.us> wrote:
>>>
>>>> For a year or so I used an aluminum WhirlyPop to roast. Besides third
>> eye
>>>> development I've noticed no ill effects.
>>>>
>>>> I believe there was news a few years ago which attempted a correlation
>> of
>>>> aluminum levels in the body to Alzheimer's disease.
>>>>
>>>> -----Original Message-----
>>>> From: homeroast-bounces at lists.sweetmariascoffee.com
>>>> [mailto:homeroast-bounces at lists.sweetmariascoffee.com] On Behalf Of
>> john
>>>> Sent: Monday, April 12, 2010 10:36 AM
>>>> To: HomeRoast List
>>>> Subject: [Homeroast] aluminum for roasting
>>>>
>>>> does anyone know if aluminum is a safe metal to have in contact with
>> beans
>>>> at roast temperatures?  more specifically, i have an aluminum cookie
>> sheet
>>>> that i'd like to use as sheet metal for parts in fabricating a new
>> drum.
>>>> the drum is cast iron, but i'm thinking of using the aluminum as an
>> exit
>>>> door for the beans.
>>>>
>>>> however, if that's safe, it's got me thinking about using a turkey
>> frying
>>>> pot as a drum.  if it's ok for cookies, is it ok for coffee?  ...would
>> be
>>>> much higher temperatures.
>>>>
>>>> thanks,
>>>>
>>>> -john
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>>>
>>>
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>>> Ambassador for Specialty Coffee and palate reform.
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