I have used Jin Bu Yi inkstick, and I feel yes, it is smooth enough for me and deep black. I have not used all the premium inksticks myself but the feedback is quite good. There are differences in each inkstick’s recipe, however, as these recipes are confidential, it is difficult to indicate it clearly on our website.
Actually Jin Bu Yi is the most popular of all with professional artists, see:
Which is the most popular inkstick?
金不易 Jin Bu Yi Fine Oil Soot Black Inkstick
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This reply was modified 7 years ago by moqiao.