Boards treated 18 months before lose their toxicity to plants; the pentachlorophenol fumes can be sealed in by painting with boiled linseed oil, plus aluminum paint for looks. A72-341; Penta preservative called "Woodlife" is disastrous to plants. A70-527; AH53
PENTA PRESERVATIVE: Effect on Plants
Some wood preserva tives give off harmful fumes if used in an enclosed space; Penta is not recommended for greenhouse use. A85-1233