[ARC5] WHINK and crystals.

[Dennis Monticelli]

I used WHINK back in my novice days (1967).  It contains HF in a very low
concentration.  I remember slow etch rates like Ken has experienced.  Now I
use Ammonium Biflouride crystals that I dissolve in water (in a small
plastic bottle) as needed for a job.  It works faster than WHINK, but not
too fast.  Like Ken, I treat the solution with great respect.  I have vivid
memories of 8X10 color glossies of fingers that were posted in our solid
state physics lab at college.  Those concentrations were very high and
careless handling carried terrible consequences.

Dennis AE6C


On Wed, Jun 26, 2013 at 8:55 PM, Richard Knoppow <1oldlens1 at ix.netcom.com>wrote:

>
> ----- Original Message ----- From: "Roy Morgan" <k1lky at earthlink.net>
> To: "Ken Gordon" <kgordon2006 at frontier.com>
> Cc: "ARC5" <arc5 at mailman.qth.net>
> Sent: Wednesday, June 26, 2013 7:56 PM
> Subject: Re: [ARC5] WHINK and crystals.
>
>
>
>
> On Jun 26, 2013, at 5:39 PM, Kenneth G. Gordon <kgordon2006 at frontier.com>
> wrote:
>
>  ...
>> I took that one apart, carefully, and dropped the crystal blank into a
>> cup…. of WHINK
>>
>
> Ken,
>
> I llooked at the Whink website and found that they make MANY products.
>  Which one did you use?
>
> What is "HF" mentioned in another post?
>
> Roy
>
>     I rather think hydrofluoric acid.  Hydrofluoric acid is will dissolve
> glass. In fact, it must be stored in something like wax or certain plastics
> which are immune to it. Hydrofluoric acid must also be handled with great
> care because in concentrated form it causes severe burns that heal very
> slowly. Concentrated acid will burn right down to the bone. The glass
> etching solutions sold for hobby etching are very dilute and are not
> dangerous although they still deserve careful handling.
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk at ix.netcom.com
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