Direct Chemical
- Chemoluminescence (Lightsticks)
- Fluorescence
- Phosphorescence
Read more about this topic: Light Sources
Famous quotes containing the words direct and/or chemical:
“Parliament must not be told a direct untruth, but it’s quite possible to allow them to mislead themselves.”
—Norman Tebbit (b. 1931)
“Ants are so much like human beings as to be an embarrassment. They farm fungi, raise aphids as livestock, launch armies into war, use chemical sprays to alarm and confuse enemies, capture slaves, engage in child labor, exchange information ceaselessly. They do everything but watch television.”
—Lewis Thomas (b. 1913)