Sunday, August 9, 2009

Light-up LED brownie

Aside from enjoying the company of friends and their amazing culinary skills, I created more art this weekend. (No wonder my dad now constantly asks if I'm dating. =P)

Anyhow, this weekend's feature is a light-up LED brownie - a deliciously brilliant dessert!

The utensils used are shown below - a brownie on a plate, a color-changing LED, a battery pack for 2 AA batteries and wires extending out, and edible silver foil (some of which is on the brownie, and the rest is in its envelope package):

I began by baking a small brownie about 9 cm in diameter and 3 cm tall in one of my Hello Kitty baking tins. After sufficient cooling, I popped the brownie onto a plate, where a cleaned LED awaited, along side a button battery that I didn't actually use to power the LED. The ultimate goal is to use such a battery though.

The edible silver foil was from Gold Gourmet, a German company, and came in a small booklet of 25 3-3/8" square sheets. It's 23 K, and consequently is a superb conductor, as oppose to the conductive silver paint I bought, which only conducted because it had ions (like sodium benzoate, a food preservative) in aqueous solution.

Below is a photo of the edible silver foil:

The foil was extremely delicate and tended to stick to objects via static, as seen below with the foil floating up, attempting to meet my finger:

The foil tore when I tried to remove my fingers from the foil. The tear can be seen in the photo below. The foil was also impossible to cut with scissors, and shearing it with a fork worked moderately well. A layer of silver remained on the fork, refusing to transfer into the brownie. I didn't manage to remove rectangular pieces from the foil, but rather irregular flakes.

I meticulously placed this flakes onto the brownie, starting at the LED that was stabbed at the center. You can see the foil wrapped about the left lead of the LED:

Instead of using forks, I settled for wooden chopsticks. Because they were made of a nonconductive material, the foil didn't really cling onto the chopstick. I had one chopstick in each hand and teased apart pieces of foil from the sheet with one chopstick doing all of the pulling and the other steadying the foil. I didn't push down hard, because pressure would transfer down to the other sheets of the booklet. Below is a photo of me transferring a torn sliver of foil onto the brownie:

To complete the two traces across and down the sides of the brownie , I used approximately 12 sq. cm (roughly 3 cm x 4 cm) of a sheet:

Then I touched the wires of my battery to the corresponding traces of the brownie and made it light up. Apologies of the poor resolution in the following photo. This is a screen shot from the video documenting my creation:

The videos (parts 1 and 2) are here:
- Light-up LED Brownie: Part 1
- Light-up LED Brownie: Part 2

lB, when are you posting some of your latest creations?

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