[R-390] Black Anodizing?

[David C. Hallam]

As a chemist by education and over 45 years of experience in the field, I
can state that strong acids of the type in used in these anodizing
discussions present minimal danger IF the proper safety precautions are
taken.  Remember they are utilized in large volume by commercial anodizers
with a semiskilled workforce.

Always use safety protection gear, goggles, rubber gloves, and a rubber
apron doesn't' hurt
Work with the smallest volume possible
Always pour the acid into water SLOWLY and never ever pour water into the
acid
When you are finished, don't pour the left over down a household drain or
into a storm sewer.  Take it to a hazardous waste disposal facility
Above all, exercise common sense

David C. Hallam

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of Tom Norris
Sent: Monday, October 10, 2005 1:26 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Black Anodizing?


For any extreme caustic/corrosive, always use chem gear - long
gloves, rubber apron, closed goggles, face shield. Or the best
handling method yet is to not handle it at all.  Nitric'll burn a
hole clean through, and keep going. (flush with liberally with water,
call 911) About the only worse acid is hydrofluoric.
Not only does it burn your flesh, but if exposure is sufficient it
binds to calcium in your body, which things like your heart need to
work.  I have no idea what my babbling has to do with either R-390's
or Anodizing.

Tom

On Oct 10, 2005, at 9:31 AM, Craig C. Heaton wrote:

> Good Morning All,
>
>     I'd like to add $0.02 to this tread. Nitric acid must be
> handled with
> extreme caution! This acid loves protein, toss a house fly into
> nitric acid
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