Add the water, salt and vinegar to the stockpot and bring it to a rolling boil. Stir in the fabric dye of your choice. Drop the geode rock into the dye water solution. Remove the newly dyed rock from the solution and rinse it with cool water until the water runs clear from it. Set the geode on the newspaper to dry. Click to see full answer. Regarding this, how do you tell if a geode is dyed?What you DO find are real geodes that have been DYED in attractive colors. Bright blues, pinks, reds – natural geodes are rarely bright colored – the amethyst (purple quartz) geodes do occur – and Look at the outer surface, which should be rough to the touch, and usually grayish or perhaps brownish. do people dye geodes? While geodes can be naturally colorful some are artificially dyed. These dyed stones often have a brighter, more intense color than what appears naturally. Why do people dye geodes? Colorful geodes tend to sell well and can be a cheap way to imitate rare stones. Keeping this in view, are geodes naturally colored? From the outside, geodes resemble common rocks, but when they are broken open they reveal a hollow cavity lined with a layer of agate and filled with crystals. Most geodes are brown or white: geodes that are very brightly colored are likely artificially dyed.What is the rarest Geode color?The rarest and most valuable geodes contain amethyst crystals and black calcite.