[Alt-photo] uv content of led lights

Matti Koskinen mjkoskin at gmail.com
Sat Sep 23 19:43:07 UTC 2017

Normal warm white leds, incandescent bulbs are just getting so rare 
nowadays. I may find one right now to try to make some cyanos.  CFLs are 
absolutely out of question. My darkroom light is a bunch of red leds, I 
haven't noticed any fogging using them when developing paper negatives, 
but the red colour makes it very difficult to see if coating of cyano is 



On 23.09.2017 22:15, Marek Piosik via Alt-photo-process-list wrote:
> Hi, what color of LED light do you want to use? Because I used remote 
> controlled LED bulb set to dimmer red and it probably fogged my carbon 
> tissue. So take care and maybe use good old incandescent light...
> Regards,
> Marek
> On 2017-09-23 20:39, Matti Koskinen via Alt-photo-process-list wrote:
>> hi,
>> Is there any risk of fogging, when using led lights and coating 
>> papers for cyanos? Of course not under direct light, but in somewhat 
>> shadowy spot.
>> tnx
>> -m
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