I don’t recommended dying your eyebrows with beard dye.
Do not use permanent hair dye. Permanent hair dyes can singe your eyebrow hairs. Castor oil, olive oil, or coconut oil can be used to strengthen the hair follicles and promote growth.
Can You Use Hair Dye To Tint Your Eyebrows?
Do not use permanent hair dye. Permanent hair dyes can singe your eyebrow hairs if they are too aggressive for your sensitive skin. Do not use them for your fragile brows. 
Is Eyebrow Dye The Same As Hair Dye?
Regular hair dyes and eyebrow dyes use the same technology as permanent hair dyes. Oxidative dyes are chemicals that must be mixed with an oxidizing agent before they will work. 
How Can I Darken My Eyebrows At Home?
It is possible to create thicker, darker brows by stimulating hair growth. It is possible to apply an eyebrow growth product. Castor oil, olive oil, or coconut oil can be used to strengthen the hair follicles and promote growth. 
How Do You Get Hair Dye Off Your Eyebrows Fast?
Put an oil or silicone-based makeup removal on a damp cloth. Softly massage your eyebrows until there is a brown stain on the cloth. This should calm your brows after a few washes. 
How Long Does Beard Dye Last On Eyebrows?
It had been quite a while since i tint my brows. The results usually last me about two to three weeks. 
Is Beard Dye Safe For Eyebrows?
Since the beard formula is safe to use on your face (as opposed to the hair formula, which is very much not), you’re able to dye your brow hair in a similar method as if you went to a professional. 
Frank Harmenstein is the lead editor of the grooming website Cut Throat Straight Razor, and has over 15 years of experience in the industry. He’s personally tested and reviewed over 200 different straight razors, and has written countless articles on the subject.