Depression Plant - cooking recipe

Ingredients

coal, charcoal or brick (several pieces)
deep dish or fishbowl (glass)
6 Tbsp. water
6 Tbsp. salt
6 Tbsp. household blueing
2 Tbsp. ammonia
2 Tbsp. iodine (or may substitute with red ink)

Preparation

Put several pieces of coal or charcoal in deep dish (glass) or fishbowl.
Around the coal, but not on top of it, pour water, salt, household blueing, ammonia and iodine or red ink.
Do not stir these ingredients or move bowl anymore than necessary.
In few days, beautiful, mossy crystal growth will appear.
For a week or 2 add salt and water as the liquid disappears.
After the crystals cover coal completely, you needn't add any more water.