In article <32960CBA.2771@online.no>, roere@online.no says...

>I get a "greenish" cast on my slides taken on the local museum, due to
>the lamps(tubes) in the ceiling.
>Should I try 40 magenta, Could I try a Magentafilter meant for
>multigrade Black and White or...

A cc30Magenta works fine for many flourescent lights.
The cheapest way to buy/use one is to get it as a gel,
and cut it down to fit dropped in behind a UV or
skylight filter.
Hope This Helps