you want "gel" used to color lights for theaters, TV studios,
auditorium concerts, open field events, etc.  "Cinamoid"
is the most expensive, but lasts longer.  There are about 165
named colors.  One supplier is Oleson Company, but there
are many others.  Just do a www.google.com search on
"Cinemoid" or "Theatrical Gel" or "Theater Supplies" and you
should find exactly what you are looking for.  I have had a
"stainded glass" sundial in my garden since 1973.
 
John

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