g’day if the person who began this thread did not mean the glow
provided by placing the object over some artificial light source
such as a l.e.d or flashlight bulb, then some colourless plastics
can have a small amount of a fluorescent substance dissolved in
them. quinine is one of these and ultra violet light falling upon
it will make it glow an eerie blue.
a small amount of fluorescein which is really an intense red will
give a green glow; there are many such dyes which can be used with
clear two pot synthetic resins to fluoresce when illuminated by
certain light wavelengths. these wavelengths are absorbed by the
dye which then re emitssome of the light in a different colour.
calcite crystals do this naturally
to illustrate this, it is possible to cast some object containing a
little of one of these dyes, then cast a ball or block of untreated
plastic over it. see it in dim incandescent light and the
internal object will be scarcely visible. allow a ray of sunlight
to illuminate it, and the internal casting will spring to life.
please excuse one handed typing; no upper case.
yes, i am repairing well, regarding the circumstances, but ribs
still painful. spend most of the time sleeping. not allowed out
without a leash those of you who saw the show ‘‘cats’’ will
understand when i sing ‘‘oh i’m like a gumby cat that sits upon the
window shelf and sits and sits and sits…’’
i have received well over 40 ‘get well’ mails; too many to reply to
individually, so i here thank y’all very kindly for your healing
wishes don’t blame the dentist; it was just me dancing the heavy
fantastic on a concrete step and diving on scungy gravel.
Cheers for now,
John Burgess; @John_Burgess2 of Mapua, Nelson NZ