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Step 3: Check the Water Temperature

Warm water over 100 degrees Fahrenheit is needed, but it’s easy to check the temperature using an included color-changing tool.
Warm water over 100 degrees Fahrenheit is needed, but it’s easy to check the temperature using an included color-changing tool. Photo: Andrew Liszewski | Gizmodo

The instructions also recommend that the water you use be a little over 100 degrees Fahrenheit in temperature, which is warm, but nowhere near a temperature that can burn. Instead of reaching for a thermometer, the kit includes a color-changing plastic skateboard multi-tool. Just drop it in the water, and if it changes from blue to neon green, the water is warm enough.

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