How does one go about bleaching flower?

You probably won't like the answer to your question but I can tell you they use toxic ingredients to bleach coffee filters white. I now use only the brown coffee filters and the unbleached flour. I would rather be safe then sorry. You want a real eye opener. Look up the ingredients much of our food comes into contact with such as styrofoam. It is toxic but deemed safe because of the toxicity level falls within a range they deemed safe. ( ? ). Unless you are the parakeet in the mine person, like one of my children who is allergic to it. It may be affecting many others that don't know that it is toxic and they just think they have a touch of food poisoning or an upset stomach. I will never buy food on foam trays or in foam containers again or use foam plates like many of our schools do ( really scary). Like many plastics it too contains toxins. It also will cause skin rashes (burn like, that blister) when someone comes into contact with it such as E. V. A. foam for swim mats etc. That is something else to look up. I sure wish some one would. It is unbelievable the toxic things men have made and continue selling for the sake of money when they know it is toxic and not in the best interest of mans well being.