electrons – n. very small particles of matter that has a negative charge of electricity and that travels around the nucleus of an atom

ink – n. colored liquid that is used for writing or printing

non-toxic –adj. not poisonous

photons – n.  tiny particles of light or electromagnetic radiation

photovoltaic – adj. of, relating to, or using the generation of a voltage when radiant energy falls on the boundary between different substances

solar panel – n. a large, flat piece of equipment that uses the sun's light or heat to create electricity

spray – v. to put something on a surface or into the air using a special container that produces a stream of small drops of liquid
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