Do cels eventually fade? Say no

Your very welcome.
And may your collection grow by leaps an bounds.
Good luck with your collection which is very nice by the way.
Roy

I always wondered why you get line fade. Thanks for explaining that Roy.
[i]bows down to your superior knowledge[/i]

Thank You,
Not superior in any way,in 40 years I've read alot of books and talked to alot of folks in the biz on the subject of animation art, I'm lucky that I have a good memory and could retain the knowledge that I have today, and in good time you also will learn the things I have and most likely will know more than me as I did not have computers in my youth like you do, more info is around today than when I learned these things.
Info should always be free so pass it on to the new folks that collect animation art and always keep your mind open to new things around you and the knowledge will come.
Have fun collecting your art it will last you a lifetime and someday you to can pass on your knowledge to someone who wants or needs it.
Roy

have sketches in the same cel book as my cels. it's either the matching sketch underneath the cel or just sketches a few pages over. so your saying that is bad to have them like that.

Sorry I'm not trying to scare you about your cels.
It would take a few years to show any damage to your cels.
What happens is the paper your drawings are made of is not a acid free type of paper and can after a time burn your cels.
Paper is made by taking tree pulp and treating it with chemicals and heat to brake it down to its base fibers and is spread out on a screen to let the water and chemicals flow out and to dry the paper, Bleach is used to make the paper fibers white.
The paper therefore has chemicals that are chemically bonded to the paper fibers and can not be removed but are sometimes neutralized by alkali chemicals added at the end of the paper making just before drying, Alkali chemicals if added to water can do just as much damage as acid or bleach can to your cels as both are very caustic and corrosive and both can burn your cels, Thats why paper turns yellow after a time it is burning the pulp it is made from.
Most so called acid free papers are made from cotton and the cotton does not have to be chemically broken down to make things out of it, But if colors are added this can alter the paper and add the chemicals that the dyes are made from therefore a lot of the so called acid free color papers are in fact to a small extent not acid free, the best to use is the off white or cotton color matte boards as these have no chemical dyes added to them and are the least likly to do damage to your cels.
As for having them in the same folder the best way to store them is to have them in there own folders, You can put them in the same order as your cels in the other folder are so that they match page for page when you look at them.
Buying a extra folder is way cheaper than letting your cels get damaged from the chemicals in the paper that will after a time burn your cels.
I keep my more costly cels in there own folders away from there drawings but this is up to you if you think you should, Go for it.
I hope this helps you out some.
Roy