What ink is the best for writing calligraphy?

It's up to you. People give you the best brush in the world, will you become Qi Baishi? Feeling is the most important thing.

No matter how good a pen is, it depends on yourself. Don't think that a good pen can write good words!

If you can, a one-yuan brush can become Qi Baishi.

I hope it's okay. Forgive my comments!