Liquid Reflector is a reflective paint – available in five colors and a clear version, and, according to the manufacturer, yields a fine surface and high reflectivity. (Note: the reflected light is white, regardless of the visible color on the surface). We’d like to test some of this – see how it holds up – [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.