ILFORD '901' filter

[Tom Kershaw]

Not seen one of these before - https://www.ebay.co.uk/itm/Ilford-D...677952?hash=item3da1360880:g:82YAAOSwwnpekypv - presumably only safe with graded papers?

 

[scheimfluger_77]

That looks a lot like the kodak safelights I used long ago. They were the ones with small cup-shaped filters and you could change between the yellow-green and the dark green. They worked well and yes it was with graded papers only. The polycontrast filters of the day were deep amber and gave very little illumination.

 

[Lachlan Young]

Apparently only for contact speed papers etc.