If it s too thick the paper will push away the pigment when you gently lay your sheet onto the pigmented water.
Thicken water for marbling.
The best paper for marbleizing is thick enough to be absorbent while standing up to the water bath but not so thick that it s inflexible.
I prepared my water in a stock pot which has measurements marked out along the inside.
The marbling paints sink to the bottom of the tray.
To thicken the water you will need methyl cellulose which is a powdery substance that mixes with water to create a consistency much like a thin gelatin.
The size might be too thin or old.
Add water to thin the colors skim the marbling base then test.
Add 1 teaspoon of methocel methocelulose powder per gallon of solution or throw out and start a new recipe.
Marbling colors are too thick.