Food coloring is an acid dye so the vinegar acetic acid helps it form chemical bonds with the egg shell dying the egg.
Marbling with acid dye.
However concrete acid stain possesses the unique property of creating a marble like effect without any additional staining techniques.
M46 blue 1 2 oz.
The science behind the fun.
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M36 red 1 2 oz.
Pro marbling kits contain the following items.
Dye easter edible egg kids marbling.
M60 black 1 2 oz.
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M10 lemon yellow 1 2 oz.
Particularly on older concrete slabs exposed to the elements the variable porosity of the slab allows the stain to penetrate to different depths creating natural areas of light and dark staining.