New video, powered green light by magnesium. https://youtu.be/Bw5Lc3O_qUs (https://youtu.be/Bw5Lc3O_qUs)
Thanks for posting. I tried watching the video but something bizarre was going on with Youtube. I was trying to understand what word you were using to describe the yellow-orange sticky stuff between the copper and magnesium (what was that ?) so I turned on the closed caption. First it was translating to Spanish. I kept trying to turn on English but was getting some strange language like Estonian or Arabian. Finally got it to stick on English but the words it was putting up had absolutely nothing to do with what you were speaking. For example when you said you were getting "about 4 volts" it translated that as "it's my soccer" and when you said "the magnesium" it interpreted that as "it seems that my child". Totally bizarre Youtube! Never had anything like that happen with Youtube closed caption and I use that fairly often there.
The material between the copper and magnesium electrodes is conductive play-doh, I was using squishy circuits play-doh there, but oddly I have found that its just a market name, perhaps used as an excuse to increase the price of that play-doh. Meaning regular play-doh is just as conductive, so regular play-doh will work just as well.
Thanks for the clarification. I see Play doh is somewhat a hidden formula but found this: compound is primarily a mixture of water, salt, and flour, while its 2004 United States patent (https://en.wikipedia.org/wiki/United_States_patent) indicates it is composed of water, a starch-based binder, a retrogradation (https://en.wikipedia.org/wiki/Retrogradation_(starch)) inhibitor, salt, lubricant, surfactant (https://en.wikipedia.org/wiki/Surfactant), preservative (https://en.wikipedia.org/wiki/Preservative), hardener, humectant (https://en.wikipedia.org/wiki/Humectant), fragrance, and color. A petroleum (https://en.wikipedia.org/wiki/Petroleum) additive gives the compound a smooth feel, and borax (https://en.wikipedia.org/wiki/Borax) prevents mold from developing.
Interesting...