Yes, it is possible to dye your beard with hair dye, although there are a few things to consider before doing so. First, it's important to choose a hair dye that is formulated for use on facial hair. Some hair dyes may contain ingredients that are too harsh for the skin on the face, so it's important to choose a product that is specifically formulated for use on the beard. Second, you may want to perform a patch test to ensure that you do not have an allergic reaction to the hair dye. Apply a small amount of the hair dye to a patch of skin on your inner arm and wait 24 hours to see if there is any reaction. Finally, be sure to follow the instructions on the hair dye packaging carefully, as the application process for beard hair may be different than for scalp hair. It's also a good idea to use a dye brush to apply the hair dye, as this will help you to evenly distribute the color and avoid getting dye on your skin. Overall, it is possible to dye your beard with hair dye, but it's important to choose a product that is specifically formulated for facial hair and to follow the instructions carefully to avoid irritation or other adverse effects.