From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=MAILING_LIST_MULTI, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 1919 invoked from network); 2 Jul 2022 03:39:14 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 2 Jul 2022 03:39:14 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 1386640882; Sat, 2 Jul 2022 13:39:12 +1000 (AEST) Received: from yagi.h-net.msu.edu (yagi.h-net.msu.edu [35.9.18.40]) by minnie.tuhs.org (Postfix) with ESMTP id 4D696406DF for ; Sat, 2 Jul 2022 13:39:08 +1000 (AEST) Received: by yagi.h-net.msu.edu (Postfix, from userid 1000) id F04FA4154FF; Fri, 1 Jul 2022 23:39:07 -0400 (EDT) To: Computer Old Farts Followers From: Dennis Boone MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <51080.1656733147.1@yagi.h-net.org> Date: Fri, 01 Jul 2022 23:39:07 -0400 Message-Id: <20220702033907.F04FA4154FF@yagi.h-net.msu.edu> Message-ID-Hash: LFSM3GEBQQ4N7EEQFJJM5HLLK2CKDZPZ X-Message-ID-Hash: LFSM3GEBQQ4N7EEQFJJM5HLLK2CKDZPZ X-MailFrom: drb@yagi.h-net.msu.edu X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [COFF] Re: "9 skills our grandkids won't have" - Is this a TUHS topic List-Id: Computer Old Farts Forum Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: > > 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. De