Epson salt?

This should work for you:

Paint for Paper

Pour 1/2 cup Epsom salt into a glass container such as a measuring cup that holds more than 1 cup of liquid. Boil water; then pour 1/2 cup of the hot water into the Epsom salt, stirring to blend the materials completely. Brush the paint onto thick dark paper such as indigo or black construction paper while the liquid is fairly warm, creating straight lines, words or designs. Allow the painted liquid to evaporate without going back over the same lines again; otherwise, the crystals may not form properly.

Wild Watercolors

Create your own crystal-forming watercolor paints using Epsom salt, table salt, food coloring and water. Pour 1 tablespoon each of Epsom salt and water into a shallow container, adding a few pinches of table salt and a drop or two of your favorite liquid food coloring. Swirl the container around to mix the materials, then paint with it on thick watercolor paper. Once the moisture evaporates completely -- which may take an entire day -- it leaves behind colored crystals atop the painted paper, adding an extra dimension to your creative work.

ref: https://www.ehow.com/how_5701668_paint-epsom-salt.html

I'm not sure which project you mean, but if you go to that page (project) and and the question there, you will get an answer. Here's another card project I found using epsom salts:

http://stampladee.com/epsom-salt-technique-for-stamping/

Hope this is the project you are wanting. Good luck.

www.hometalk.com › epsom-salt-craft-projects

"Roll your bottle in your tray of Epsom Salt and cover well." See the stunning result! ... With some Mod Podge (fast drying glue) and Epsom Salts....Create beautiful holiday ... Popular Project Book. s 13 kitchen paint colors people are pinning like crazy ... Organizing My Craft Room - Greeting and Craft Card Organizer.

Look up projects at the top left where it says SEARCH DIY IDEAS HERE.

Hi Victoria, hope this helps you out, https://www.allthingswithpurpose.com/frozen-ice-painting/#:~:text=Mix%20an%20equal%20amount%20of,paint%20onto%20the%20dark%20paper.

Hi Victoria, there are many, many projects on Hometalk using Epsom salt. One of the prettiest and simple projects I've done myselft is to roll a tall glass cyclinder in epsom salts after applying a good amount of whie glue all over the outside. You sometimes have to do this in steps...maybe a quarter of the length of the cyclinder at a time. Beautiful for the holidays! Yet very simple. Here's Hometalk posts....

https://www.hometalk.com/search/all?filter=Empsom%20salt%20

This should help you: https://www.youtube.com/watch?v=YDSJ3uxMwG8

Here is something I found https://www.ehow.com/how_5701668_paint-epsom-salt.html

Hello! If it something that you saw in a Hometalk posted project, ask your question on that precise post.

This is a general Q&A posting area, the person who's project you're asking about would likely be unaware of your question about their project post. To get an answer about a specific post, ask the question directly below the project that will likely get you a reply from the Hometalk poster.

If you ever want to go back to see a particular project, just click on the little blue house at the top of this page, left-hand corner. If you can't find a particular project, you can use the search bar. Also, please consider checking out "Explore Projects" for even more additional ideas.

Hope this helps.