* PATENT FOR SELL *TO WHOM IT MAY CONCERNpatent reusable hot/cold gel packs of changeable color .these gel packs are similar to all gel packs in the world used for hot and cold therapy , but It is unique in : It has the ability to change Its color by heating or cooling .At room temp., It has a rose color . and by heating it takes different grades of pink color according to the temp. reached . and by cooling It becomes colorless .It is composed of very cheap raw materials .It is the only gel pack product in the world that has the ability to change its color with temp. .for more details you can contact me my phone no. 0122495623.SINCERELY :EMAD SADEK AZIZ .