I tried at least a dozen different solvents. Wear safety glasses and nitrile gloves, as it can be absorbed by the skin. Make the mix outside with good ventilation or inside under a vent hood. WARNING: Naphtha is a sickly-sweet smelling solvent that wants to dissolve your brain cells if you breathe too much of it. You want to end up with a mix about the consistency of smooth peanut butter. Then add the silicone caulk and mix it very well with a Popsicle stick or stirring rod. First mix the graphite and corn starch together with enough Naphtha to make a thick paste of the powders. A typical first mix would be 3/4 teaspoon of graphite to 1/16 teaspoon corn starch to 1/4 teaspoon silicone caulk. Add three parts graphite powder (by volume) to 1/4 part corn starch to one part silicone caulk. Mixing Oogoo II Oogoo II is basically Oogoo with the addition of graphite to make it conductive and a solvent (Naphtha) to make it possible to mix. The conductive fabric is glued to a conductive metal handle which transfers the bodies capacitance to the screen. Because this fabric is 70% transparent it allows you to see exactly where you are touching the screen. Transparent Stylus Tip Two of the stylus made in this instructable use VeilSheild conductive fabric as the stylus tip. When you hold and touch a conductive stylus to a screen your capacitance is transferred to the screen and detected by its sensors. Such screens are designed to detect changes in capacitance and locate exactly where they are on the screen. When you touch a capacitive sensitive screen, you change the capacitance where you touch. Every persons body has a small capacitance. Capacitive Stylus The standard stylus for a capacitive screen uses conductive rubber or conductive foam to replace your finger on the screen. While it is not as conductive as wire or conductive thread, it is more than conductive enough to make a variety of capacitive stylus. This creates a silicone rubber which can be made thin enough to paint on or thick enough to cast into molds. Oogoo II-A Conductive Rubber You can make your own conductive rubber from silicone caulk, corn starch and graphite powder.
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