[QuadList] Edivue--Sprague Magnetics--"Sprague Mag" Magnetic Developer

[Ted Langdell]

On Sep 8, 2011, at 5:29 PM, lee williams wrote:


> Does anybody know of anyone still making Edivue?
> Have a client who is almost out and looking to get a can or two.
> Thanks
> Lee

"Edivue" isn't on the market.

However, Sprague Magnetics has a product—Sprague-Mag—that may do the  
needed job:

http://www.sprague-magnetics.com/faq-7.htm

Technical details and how to use it is described here:
http://www.sprague-magnetics.com/library/sprgmag.pdf

And partly presented here for educational purposes:

As with many virtually indispensable tools, the concept of the  
developer is simplicity itself. There are iron particles suspended in  
a fluid with a high, rapid evaporation rate. Thus, the developer is  
placed onto the magnetic surface, the liquid evaporates, and the  
magnetic particles orient themselves in accordance with the magnetic  
pattern on the surface of the material until the magnetic pattern is  
fully delineated. The regular particle size ranges from 1 to 3 microns.

Environmentally safe. There used to be a number of products available  
similar to Sprague-Mag, but all of them used ozone depleting CFCs to  
insure quick liquid evaporation. With the new federal regulations  
restricting the use of such chemicals, these other magnetic developers  
have disappeared from the marketplace. Sprague-Mag does not use CFCs,  
rather it uses an environmentally friendly and acceptable (under  
current regulations) Methyl Nonafluoroisbutyl Ether/Methyl  
Nonafluorobutyl Ether as the evaporative liquid that the iron  
particles are suspended in, and for an aerosol propellant in the spray  
version, Sprague-Mag uses carbon dioxide.

NOTE: SDF-130A has no effect on magnetic cards, but is an active  
solvent for some materials such as those used in cassette bodies.  
Effect on tape and tape coating is minimal. Screen/test the material  
prior to use.

Directions for use: Shake first to insure proper and even suspension  
of the magnetic particles. Apply to an inclined surface with a  
cellulosic paper or tissue as backing to absorb excess Sprague-Mag.  
This immediate removal of excess material yields a distinct and clean  
visual trace. When done, remove the Sprague-Mag trace with a cleaning  
cloth or Scotch removable tape #811, or “Post It” adhesive backing (3M  
or equivalent).
12806


Hope this helps.

Ted

Ted Langdell
Secretary

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