Before you attend your eyelash tinting, eye brow tinting or lash lift appointment at Chester MediSPA, you must first attend for a free patch test appointment with one of our therapists. The patch test is designed to show how your body reacts to the dye in case of any allergic reaction. All patch tests involve applying a small amount of each product to your inner arm and a small plaster placed on top. This way, if you do have an allergic reaction, it should be small and controlled. The patch test needs to be carried out at least 24 hours before your actual appointment to allow time for any delayed reactions.