Bottom line, none of this shit really works and chances are you are going to fuck up your plants altogether. You want purple bud get a proper purple strain. You want a specific taste/smell? Get a strain that has terpens governing those specific properties you want. Don't add any shit to your water, it will lock out nutrients and kill your plants and even if it doesnt kill them your yield will be minimal, your potency will be affected as well and you won't have achieved any flavoring or coloring any way... If you do a search in any cannabis forum you will be amazed by how many times this has been brought up and how many people have tried those remedies. The result has always been the same. 100% failure...