I tried some Carfentrazone(Quicksilver) on a few weeds on a vacant lot today. A neighbor mows it. After about 48 hours the youngest weed leaves turned completely brown. Older leaves slightly brown or not affected. Sprayed ground ivy, chickweed, oxalis, clover, dandelion, violets, mulberry tree. Leaves that were half of their adult size or smaller were most affected. Carfentrazone is the new ingredient in Speedzone and Redzone. I have not decided if I like this stuff or not. Anybody else have results to show or talk about?