Mark one side of your watercolor paper with an a and use a sponge brush to apply alum solution evenly to that side of the paper.
Marble paper with liquid starch.
Then lower your paper into the starch with the alum treated side down.
We made our own starchy medium with cornstarch and it was only partially effective but apparently you can use liquid starch to marble paper easily as the starch keeps the paint near the surface.
Next pour liquid starch into a tray and add drops of paint to the starch to create your design.
Hold the paper over the starch while the excess drips off.
See recipe to make homemade liquid starch above how to water marble with acrylic paint.
Remove the paper from the water bath and place it painted side facing up on newspaper to dry.
Liquid starch is a much more dense liquid and will often allow for the paint to sit at the top allowing for you to dip an item into it for marbling.
Trays should be larger than paper in cups dilute 2 parts of each paint color in 3 parts water.
Place the paper painted side facing down onto the surface of the water in the tub to remove the starch.
In one tray mix a starch bath with 4 cups liquid starch and 1 tsp.
Fill the other tray with water.
Corn starch in 1 2 cup cold water.
For best results allow the marble paper to dry overnight.
Bring 6 cups water to a boil in a sauce pan.
To marble paper start by mixing alum and warm water and wiping the solution over your sheet of paper with a sponge.
You can also switch out the water and use the liquid starch instead.
This is a marbling technique for kids that i ve always wanted to try and sorta did and sorta didn t.