Are "acid-free" backing boards truly acid-free? Time to pH test & find out!
28 28

414 posts in this topic

grayzr   
  • Member
  • 394 posts
  • Location: Earth-616

This is a very useful thread.

Thanks for all the info and to everyone who has contributed :applause:

Share this post


Link to post
Share on other sites
alleycat_tn   
  • Member
  • 1 post

WOW! Such a great post. I've always been wary of the single coated backing boards. Kudos to the OP!

Share this post


Link to post
Share on other sites
lizards2   
  • Member: Seasoned Veteran
  • 36,913 posts
  • Location: Oregon Outback-Duckland!

  • I have no registry points, so I exercise my geek superiority by being a jerk.
9 minutes ago, AllenBurton said:

WOW! Such a great post. I've always been wary of the single coated backing boards. Kudos to the OP!

If they were any good at all, they'd dress in layers. :sumo:

Share this post


Link to post
Share on other sites
kingjohn3   
  • Member
  • 14 posts

Can anyone tell me if Mylar bags will yellow over time? I have a ton of them and I thought that's the exact thing there were not supposed to do

Share this post


Link to post
Share on other sites
mschmidt   
  • Member: Seasoned Veteran
  • 19,874 posts
  • Location: Illinoise
Just now, kingjohn3 said:

Can anyone tell me if Mylar bags will yellow over time? I have a ton of them and I thought that's the exact thing there were not supposed to do

They won't.

Share this post


Link to post
Share on other sites
kingjohn3   
  • Member
  • 14 posts
4 minutes ago, mschmidt said:

They won't.

Didn't think so. I maybe should explain further what I have. I have a 2" thick stack of empty bags that look and feel like Mylar but when they're all stacked together like that it's a dirty yellow color.  Does that mean these are not true Mylars? I also have some with old boards in them that I cant tell if they are legit, any way to tell?

Share this post


Link to post
Share on other sites
mschmidt   
  • Member: Seasoned Veteran
  • 19,874 posts
  • Location: Illinoise
3 hours ago, kingjohn3 said:

Didn't think so. I maybe should explain further what I have. I have a 2" thick stack of empty bags that look and feel like Mylar but when they're all stacked together like that it's a dirty yellow color.  Does that mean these are not true Mylars? I also have some with old boards in them that I cant tell if they are legit, any way to tell?

Yeah, "real" mylar (Mylar type D or Melinex) is completely inert, so it won't yellow over time. 

With boards it's easy - if they have smooth surfaces, they're not archival safe.

Share this post


Link to post
Share on other sites
ThreeSeas   
  • Member
  • 561 posts
  • Location: Michigan
4 hours ago, kingjohn3 said:

Can anyone tell me if Mylar bags will yellow over time? I have a ton of them and I thought that's the exact thing there were not supposed to do

I can tell you that mine have not. I bought mine when I first learned of them in the 80's, so the few hundred bags I bought still look like they did when I bought them. At the time they were called time-loks, mylites, and another name I cannot remember for the third type of mylar I used. The time-loks had a pre-made top flap, the mylites were really thin and you have to fold the flap, the third type I have are as thick as the time-loks but the top flap would really take some force to fold it, so I typically left it alone. All of these do not show any noticeable aging and Like I mentioned, even after all this time.

Share this post


Link to post
Share on other sites
CKB   
  • Member
  • 8,188 posts
7 hours ago, kingjohn3 said:

Didn't think so. I maybe should explain further what I have. I have a 2" thick stack of empty bags that look and feel like Mylar but when they're all stacked together like that it's a dirty yellow color.  Does that mean these are not true Mylars? I also have some with old boards in them that I cant tell if they are legit, any way to tell?

Sounds like they might be thick ultra-pro polys or something.  Those things are terrible.   Take a quick picture.

Share this post


Link to post
Share on other sites
kingjohn3   
  • Member
  • 14 posts

I'll try to get a pic soon of what I have. Well I guess Gerberizing my collection is a no brainer but I'm thinking of using them with my "Archival Safe" NON- mylar BCW bags. Is that acceptable in terms of keeping a collection safe if I replace the bags every 5 or so years or does that defeat the purpose? Is there any kind of weird chemical reaction that could happen between the Gerber boards and polypropylene bags?

Share this post


Link to post
Share on other sites
kingjohn3   
  • Member
  • 14 posts

Best pic I could get. More yellowy in person. So what do you think?

IMG_0363.JPG

Share this post


Link to post
Share on other sites
lizards2   
  • Member: Seasoned Veteran
  • 36,913 posts
  • Location: Oregon Outback-Duckland!

  • I have no registry points, so I exercise my geek superiority by being a jerk.

They look to thin to be mylar.  I suppose they could be mylites with filth on them.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
28 28

  • Welcome! Sign up and jump in!

    Membership and use of the boards is FREE! The knowledge available on these boards about comic collecting is an amazing resource for less experienced collectors. It's also a great place to talk about expert comic collecting topics with other experienced collectors. We hope that you find what you came looking for here, but more than that, we hope you find your new comic collecting home.

    Don't let the friendly banter and close knit community put you off. You're only a few posts from being part of the gang!

    After you sign up, introduce yourself! We'd love to know more about your collecting.

  • Upcoming Events

    • 28 April 2018 05:00 PM Until 29 April 2018 12:00 AM
      0  
      Little Giant Comics OLD SCHOOL COMIC SHOW 
      Here's the deal, I wanted to create the kind of show I would want to attend.
      GREAT COMICS, GREAT ART & ARTISTS!
      I want to enter a room filled with amazing comics, incredible art and talented artists, I don't think that's too much to ask.
      Seems like every show I attend only has a small amount of comic vendors (usually the same 3 or 4 people I see at every show), the rest of the floor is fidget spinners, Cosplay stopping in front of your booth for photo shoots, sweaty ROOT BEER mugs everywhere dripping on your comics or art, Pirates running around, knick knack patty whacks, energy drinks, Ice Cream vendors and flea market fodder........
      NO MORE I SAY!!  
      OLD SCHOOL COMIC SHOW
       
       
    • 20 May 2018 05:00 PM Until 21 May 2018 12:00 AM
      0  
      The third and original ( after a 7 year hiatus )  Rocky Mountain Comic Convention will be held on 
      Sunday May 20, 2018 10am - 5pm DoubleTree By Hilton Hotel Denver Stapelton 4040 Quebec Street, Denver Co. 80216 1-866-238-4218 Admission still only $10 Admission includes entry to raffle   We will have more than 30 dealers from all over Colorado and the US offering a wide variety of Comics and Comic Art from all era of collecting. This show will be run by the same people that run the very popular CalComicCon!