[pure-silver] Re: Humidty Controlled Storage

A heating bar can be quite effective. At one point I shared a room with a couple of spectrometers whose bases were heated mildly so as to protect the optics inside.  My boss was particularly proud of one NaCl prism which had not neededd to be repolishedd in thirty years.
On a practical side rubermaid containers,
http://www.rubbermaid.com/Category/Pages/ProductDetail.aspx?Prod_ID=RP091418
which can be sealed, and sachets of silica gell are an effective solution. Silica gell can be bought cost effectivly from florists, they use it to preserve dried flowers, and if you get a few sachets with indicator pellets, you can dry it out in the oven once it starts to reach its limit for absorbing moisture.  When I moved to the states, I left some gear in sealed (closed and taped) containers with about 200g of silica gell pellets poured into each and it had no problems.  My thinking was that taping the edges of the container lids would reduce gas//air exchange and that what fresh air that did arive as a result of temperature cycling would be dried out by the silica gel.
All the best
Laurence Cuffe

On Dec 27, 2011, at 04:50 PM, John Bower <john@xxxxxxxxxxxxxxxxx> wrote:

This "piano bar" looks like it's just a heating element. As such, it
will raise the temperature of a space, which means that the Relative
Humidity (RH) will go down. Because warm air can hold more moisture
than cool air, if the number of molecules of water vapor doesn't
change in a given volume of air, the RH will go down when the air is
warmed. The number of molecules of water vapor in a given volume of
air is the Absolute Humidity. For cellulosic materials (wood, paper,
etc.), RH is important, because they absorb more moisture when RH is
higher. In winter, the cool air may feel dry but, because the cool
air can't hold much moisture, the RH can be high, and paper (or wood)
will really want to suck it up.
--
John Bower, an Indiana Artisan
http://www.studioindiana.com/



On Dec 27, 2011, at 4:18 PM, Robert Hall wrote:

> We have had a piano for over 50 years. Inside is a bar that acts as
> a dehumidifier.
>
> This is similar to what we have. I've no idea if it will work for
> you but just an idea..
>
> http://www.kingmaker.net/mears0.htm
>
> Robert Hall
> www.RobertHall.com
> www.RobertHall.com/workshops
> www.facebook.com/robert.g.hall
>
>
>
>
> On Tue, Dec 27, 2011 at 12:52 PM, Eric Nelson <emanmb@xxxxxxxxx>
> wrote:
> In talking with some folks, the humidity where I'll be moving to
> next year is a concern for camera gear and prints.
> I've not gotten a price quote yet, but am wondering if there is a
> simple inexpensive way to make a cabinet that can achieve similar
> results as a pro cabinet like these. It would be better to have
> something that doesn't cool too much if at all as condensation upon
> removal of a camera etc, would perhaps negate any benefits
>
> http://www.xdry.com/dry-cabinet/desiccator-xd3-1104-01asp
> http://www.alibaba.com/showroom/camera-humidity-cabinet.html
>
> Thanks
> Eric
>

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