BORIC ACID also known as sodium tetraborate decahydrate contains Boron and is commonly used in cleaning remedies, insect eliminators and as a flame retardant for wood and cellulose materials this is a versatile and well established material.
Although considered a natural remedy caution should be used when handling this product as boric acid is moderately toxic. A dose of 2 to 3 grams, if ingested by an infant, could be fatal. For children, the fatal dose is 5 to 6 grams, and for adults it is 15 to 20 grams. Consequently, boric acid should be handled with caution and kept out of the reach of children.
Cockroach & Ant Killer
Insects must come in direct contact with material to work, either consumed directly or indirectly after preening feet after walking through material.
Apparently works by making insect mouth parts too soft to consume food.
Mix 1 tbsp. each of boric acid, cornmeal, flour and sugar.
Spread a very thin layer on the surface to be treated (so the roaches walk through it) or put the mixture in a shallow dish and place it behind appliances or wherever there are cockroaches and bugs.
You may also wish to add the mixture to a clean squeeze bottle and squirt the powder into cracks, holes and crevices where insects have been seen.
Flea infestations in Carpets
To use as a natural flea repellent simply sprinkling boric acid on all the carpets and furniture throughout the house, making sure to sprinkle under all furniture etc. Vacuum the boric acid up 24 hours later and it is said to prevent fleas for 1 year(from pest removal companies) or until your carpets are shampooed.
Flame Retardant for Wood & General Cellulose Items
Common practice is to prepare a 5% solution with water and soak paper / cellulose / wooden material in it to thoroughly wet. The item is then allow to dry and the material becomes flame retarded. Warning boric acid is water soluble so cotton clothing will not stay flame retarded once washed.