NOT A GOOD IDEA. !!!

I would suggest that this doesn't have to be approached as a work of art but rather an attempt to capture a very illusive reflection on a stinkin' snake. Fotkaman, obviously a person who delights in irritating people, as absolutely repulsive as his avatar is, got part of it right - walk around the snake and see where the effect is most noticeable, and take several shots of it bracketing for different light effects. Consider a close up of a section using your 'daylight torch' (quartz or led flashlight) LOL! and shooting a small segment where the effect is most pronounced. An overall shot and some close up sections, maybe the head.

NO POLARIZER. A polarizer's purpose is to eliminate reflections - it will cause the effect to disappear rather than heighten it. The first and most brilliant rainbow I ever shot, taught me that lesson. One of the reasons it's hard to catch a reflection such as this or a rainbow is because the multi-coating on your lens that is there to reduce flare and reflection robs the effect of it's brilliance as it comes through the coating. Flare was a real big problem with uncoated lens and now it's fixed but at the expense of our ability to catch such reflections as this in all their glory. If, after you've tried this, since the snake isn't going anywhere, then I would resort to HDR.

You're shooting Canon. In the latest release of Canon's software RAW processing program 'Digital Photo Professional,' (DPP) Canon has (have, for the Brits, Kiwis, and Aussies ;) ), included under the 'Tools' menu selection, a very efficient HDR processor that gives you about all of what you need to process your HDR images to achieve about any effect you choose. I would suggest you go to Canon and download the updates to the software there, especially DPP and install it. If you haven't installed the CD that came with your camera, you will need to do that first or at least have the CD in your CD/DVD drive when installing the update: Down the page, under 'Drivers and Software,' select your operating system and version here: http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eos_rebel_t3i_18_55mm_is_ii_kit#DriversAndSoftware - then download what you need for HDR if you get that far. Canon's software is quite good and powerful if you bother to learn it. About the only thing you might need anything else for is 'layers' if you get to that point. DPP allows you to do your HDR on your RAW files as opposed to tiff or jpg. It's an advantage you will come to appreciate as you become more familiar with RAW v. jpg.

I have just had a bout with some iridescent reflections on some Grackles with less than stellar results and I've attached a couple of examples below: