Computer Old Farts Forum
 help / color / mirror / Atom feed
* [COFF] Re: "9 skills our grandkids won't have" - Is this a TUHS topic
@ 2022-07-02  3:39 Dennis Boone
  0 siblings, 0 replies; only message in thread
From: Dennis Boone @ 2022-07-02  3:39 UTC (permalink / raw)
  To: Computer Old Farts Followers

 > > Except that we didn't use red light in our darkrooms at all, at
 > > least not from the 1970s and on. ...

 > Correct.  I started darkroom work in 1964, and from the beginning we
 > used amber safelights.  I don't think red safelights have been used
 > since long before that.  Another thing that the film industry
 > continually gets wrong.

It really isn't true that red filters quit being used.  Some materials
are not sensitive to the broader spectrum of an amber light, making it
feasible to use one.  The broader spectrum is probably easier for many
people to work under.  Some manufacturers recommend amber safelights on
the strength of improved working conditions even for materials where an
amber safelight is marginal.

But some materials _are_ sensitive to parts of the amber, or even to the
whole visible spectrum, and other types of filter (or even no light at
all) must be used.

A quick perusal of B&H stock indicates that lots of red safelights are
still offered.


^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2022-07-02  3:39 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-07-02  3:39 [COFF] Re: "9 skills our grandkids won't have" - Is this a TUHS topic Dennis Boone

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).