Hai friends I would like to express my personal experience in lipton yellow label tea bags. I was regularly using this tea in my office. One day by mistake I take some water from the kettle which is boiled by my colligue before 15 minutes or more. I take water and put one tea bag. I found that water was not hot for making a tea. But when I put the tea bag. It begins to spread in water and I got full color as perfect tea. Very clearly I know that that water was not at all hot for making a tea. But how this happened? Then I realised that they are using some coloring substances in the tea powder. So everybody should beware of this and if you have any doubt please check by taking some medium hot water.