In general, we always recommend testing the products on a concealed area before using them for the first time. If you have the impression that a little colour comes off during the first test with the cleaner, don't be put off. As Glowbag does not contain any alcohol or chemical substances, it cannot remove any colour on its own. However, if you have the impression that it has, it may be because the colour pigments from dyeing the leather have not been sealed or have come off over time. The age and condition of the leather can favour this. However, you don't need to worry that all the colour could come off. It is best to use the cleaner sparingly and do not spray it directly onto the bag. Instead, dampen a cloth with the cleaner and carefully rub out the stains. Leave it to dry thoroughly and then be sure to use the conditioner and leave the bag to dry thoroughly.