1. Oxidation with chromium trioxide gives juglone , a naturally occurring dye. 2. Juglone is currently being studied for its anticancer properties.3. Chemically, lawsone is similar to juglone , which is found in walnuts. 4. Fortunately, juglone tends to stay put, and is not a universal killer. 5. Black walnut roots, leaves, and husks contain juglone , which is powerful stuff. 6. In America during the early 1900s, doctors prescribed juglone for the treatment of various skin diseases. 7. Heartwood also contains juglone ( 5-hydroxy-1, 4-naphthoquinone ), also an active antimicrobial principle. 8. Well drained and aerated soils will host a healthy community of soil microbes and these microbes will help to break down the juglone . 9. Regiolone has been isolated with juglone , betulinic acid and sitosterol from the stem bark of " J . regia ". 10. Juglone is present in all parts of the tree, but is especially strong in the roots, which extend far beyond the canopy.