Editing MUFOB ARCHIVE/02 1966 MUFORG Bulletin 01 (section)

=== Spectrum Analysis ===

For aircraft and rockets of unknown type it is possible to determine the fuel used. It is possible to tell whether a high-altitude aircraft is rocket-assisted, if so what type and power. Kerosine/oxygen rockets give vastly different results to hydrazine/nitric acid rockets.

We are lucky in that the UFO is luminous over the whole surface of the disc. If the light is strong (as from such a body) then more accurate readings can be obtained. If the light produced is analysed properly, it is an easy matter to determine the origin of the light. By this I do not mean whether or not the light came from a port hole but, rather, how the light was produced. A good analogy is a street light. Assuming one cannot see the shape of the light, it is possible to tell the type of light it is, whether tungsten, mercury arc, or fluorescent (sodium is obvious), what type of glass surrounds the bulb, and even which company made the lamp!

Using this technique, an apparently self-luminous UFO can be shown to be luminous only by reflection from sunlight, glowing itself, or the air around it glowing. Prominent lights, e.g. the intense, blue light from the top, could be mercury, cobalt, copper, or chromium arc, or just a white light surrounded by blue glass.