Lastly put your tree into the mixture and watch it come to life. It should take about an hour to grow and start to see crystals, but wait over night to see it fully grow.
The cardboard tree uses capillary action process to draw the magic solution up its entire shape until the cardboard has soaked itself in the solution. The solution then evaporates, and is sped up by the ammonia. As it starts to evaporates off the tree crystals are left behind on the branches of the tree.As the bluing and salt water make their way up the tree, the water begins evaporating. These means there is less water able to support the bluing particles and dissolved salt. This evaporation allows the salt and bluing particles to crystallize, resulting in your beautiful tree.