Mehndi is popular not just in India and Pakistan but also in the Arabic countries, where it is a part of the culture too. The mehndi designs inspired from Arabia are popularly termed as Arabic Mehndi. The main distinction between normal Indian Mehndi and Arabic Mehndi is the use of motifs inspired by their religion and culture. The Arabic mehndi designs are nowadays largely used to add some uniqueness to age old Indian designs, thus we see a lot of mixed patterns.
But there is another difference between regular Indian mehndi and Arabic mehndi designs which is the use of black mehndi that makes the Arabic designs more prominent and beautiful. Even in India, many mehendi artists now prefer to highlight their designs using black mehndi as an outer liner to make the design more prominent.