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There are a few headaches associated with using a typical soldering iron. One common in particular is burning your hands starting your shirt on fire or other burning hazards that can occur with a heat based soldering iron. The other is the smoke from the solder burning onto the iron oftentimes get in your eyes resulting in an unbearable pain and temporary blindness. As someone who wields a soldering iron every now and again to do a mod here and there like for a Pocket PC cradle or accessory, the ads I've been seeing on TV for the cold heat soldering iron sound very appealing. The idea behind the cold heat iron is that it will not burn skin. It heats solder, yet when you pull it away from the solder it somehow cools off. Not sure how this works in the real world, but sure sounds interesting. PC Magazine has a review Of the cold he soldering iron you can take a look at if you are interested in one of these. The reviewer Bill Macrone demonstrates the cold he soldering iron by doing some modifications on Fender Blues Jr. guitar amplifiers. 'I'm an unapologetic wires-and-pliers hardware geek. I built my first computer with a soldering iron back in 1976, and I'm still soldering. You may have seen the Cold Heat soldering tool advertised on TV or in your local RadioShack-the company claims that you can solder a connection and then touch the tip just seconds later without burning yourself. I've been testing one, and it's true.
The Cold Heat tool looks like a streamlined, oversized marker with a switch on the top and a short, split projection on the business end that bears some resemblance to a deer's hoof. A white LED sheds light on the task, and four double-A batteries provide the power. Unlike those of conventional soldering irons, the tip does not get hot until you touch it to a joint. The split tip is made of carbon, and when it comes into contact with the joint, the metal completes the circuit between the two carbon electrodes. Despite the mere 6 volts, the current flow between the electrodes causes the wire to heat up enough for solder to melt.' Via Gizmodo
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