This production contains ingredients which may cause skin irritation on certain individuals and a preliminary test according to accompanying directions should first be made. This product must not be used for dyeing the eyelashes or eyebrows; to do so may cause blindness. Rinse eyes immediately if product comes into contact with them. If swallowed, get medical help or contact a Poison Control Center right away. Patch test 48 hours before using: before applying the client should carry out a patch test or ask a doctor to do so even if the client has used color products form this brand or another brand before. Some people are allergic to hair color products. Allergies can develop or worsen suddenly, even if the client has used this or another hair color product previously. Patch test: 1. Thinly apply the product over a 1" x 1" (2.5 cm x 2.5cm) patch on the inside of the elbow, using a cotton wool tip, and leave on for 45 minutes. 2. After 45 minutes, thoroughly remove the product with lukewarm water. 3. Do not use product if any reaction (burning, itching, swelling, irritation or any other abnormal reaction) occurs either during the test period or within 48 hours following the test. It must be understood that this test is simply a precaution and even if no reaction occurs during the test, it does not conclusively mean that no allergies will occur during further use.