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'[EE] Question - Seno GS Etch System White Powder ?'
2010\01\06@115544 by Peter

picon face
Update: I found a neutralizer kit on the net and the MSDS sheet seems to say
that it contains diluted NaOH, indicator sticks, and little else. Personally, I
would use sodium bicarbonate (baking soda) and gypsum.

Peter

2010\01\06@133135 by Picbits Sales

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face
Whatever you do dont use one coat plaster to neutralise the Ferric Chloride

It froths and foams, gets very hot and makes a heck of a mess lmao.

Dom

----- Original Message -----
From: "Peter" <spam_OUTplpeter2006TakeThisOuTspamyahoo.com>
To: <.....piclistKILLspamspam@spam@mit.edu>
Sent: Wednesday, January 06, 2010 4:50 PM
Subject: Re: [EE] Question - Seno GS Etch System White Powder ?


> Update: I found a neutralizer kit on the net and the MSDS sheet seems to
> say
> that it contains diluted NaOH, indicator sticks, and little else.
> Personally, I
> would use sodium bicarbonate (baking soda) and gypsum.
>
> Peter
>
> --

2010\01\06@185026 by Peter

picon face
> Whatever you do dont use one coat plaster to neutralise the Ferric Chloride
>
> It froths and foams, gets very hot and makes a heck of a mess lmao.

Add baking powder until it stops reacting then add plaster of Paris and make a
nice brick.

Peter

2010\01\07@171141 by Barry Gershenfeld

picon face
Ah.  I had been wondering if "brick" was the past tense of "plaster of
Paris".  In the scope of this discussion, I mean.

Add baking powder until it stops reacting then add plaster of Paris and make
> a
> nice brick.
>
> Peter
>

2010\01\08@042916 by Peter

picon face
Barry Gershenfeld <gbarry42 <at> gmail.com> writes:
> Ah.  I had been wondering if "brick" was the past tense of "plaster of
> Paris".  In the scope of this discussion, I mean.

Well from the causality chain point of view brick could be the future tense of
plaster of Paris. But what else could it be? The brick is a reference to the
fact that some places seem to require the disposal of chemicals like used FeCl3
etchant loaded with copper in solid form, to prevent copper salts getting into
the water supply. The 'brick' is actually made by mixing the neutralized
FeCl3+NaHCO3 solution in a plastic bag with plaster until it hardens. What brick
did you have in mind?

Here is a crafts/jeweler's application of FeCl3 neutralization with baking
powder, with pictures:

 http://www.volcanoarts.biz/muse/artitude/pinocchio/index.htm

 Peter


2010\01\08@161630 by Barry Gershenfeld

picon face
Sorry my statement wasn't clear; I was trying to add a touch of humor.  I
saw in earlier posts that Plaster of Paris would neutralize the ferric
choride, but I didn't know if you just got neutralized sludge, or whether it
would harden as the plaster would have normally.  I figured if it hardened
(into a "brick"), then you could put it in the trash, thereby annoying the
landfill guys, rather than putting it down the drain, and annoying the water
treatment guys.  I see that nowadays you have to present it to a recycling
facility, which doesn't surprise me.  But I think I etched my last board in
1987 or so, so I don't suppose it matters all that much here.  Now I work
for people who get boards made and then give them to me :)

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