How to get water damage out of a painting?

Hi all! My mom got this painting a couple weeks ago, dated 1915. She took it out of the frame as it was pretty nasty in there. She'd like to know if there is anything she can do to uncrinkle it at all, before putting in a frame again?
TYIA!

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I'd say under a piece of glass with something heavy on top. I would also recommend putting acid free paper on top so it's not touching the glass

 

Years ago someone advised me to iron a watercolour before putting weight on it, and it worked.
This site explains how, although I used a lower setting:
https://expeditionaryart.com/blog/2014/11/flatten-watercolors/

Then there is this, which I have never tried:
https://susanchiang.com/blog/how-to-flatten-watercolor-paintings

 

Thank you both! I'll pass that info along to her

 

Coming back to this, I passed on the info but she actually wanted to know how to store it until she starts working on it/until she finds a frame. Will tissue paper work or does it need something more special? Thanks

 

Hi all, just wanted to bump this

 

I would put it between 2 pieces of 1/4" acid free foam-core board and tape the edges. I store several of my most valuable prints this way. Keeps them flat and secure. Store horizontally if possible. Foam-core board should be a couple inches larger than the artwork on all sides.

 

Thank you Brad! I just relayed to my mom. She's got it between tissue paper and under a book at the moment, we'll change it once we get our hands on some foam-core! Thank you.

 

Just a note that there are two types of foam core. The type sold in many art stores is NOT acid free. You usually have to get that in a frame shop. May be different where you are, but you should read the labels or ask. Acid-free is usually matte on both sides, and non is glossy.

If you go to a frame shop, you can also ask them about their services and if they have a dry mount or heated press table. It's usually used for adhering things, but you can absolutely use it just to press artwork flat. It's AJs suggestion, but a large "iron" all in one go. I've done this often and it always works to relax and press fibers.