Hi, New member here. I have 18 hens (one rooster until Saturday, he's 'chilling' in the fridge. Mean old buzzard). I have a 80' pond by the house that the hens drink from when they free range. The pond has been overcome with 'creeping primrose' each year to the point where I want to use Roundup. I would like to use the blue dye in the pond, but I have no clue if it will affect the girls or the eggs. Anyone have any experience or input? Thank you so much! Carl and Sandy Masters.