@Tobi
For inks suitable for Chinese Ink paintings, look at how the ink dilutes, more specifically what kinda of colours the black will be come. Some black ink will give a warmer (almost brown look) while others will look cool (bluish). Some black inks just dilute to a neutral gray.
Unfortunately, it's difficult to tell how the black ink will dilute unless you test it for yourself.
Since Chinese ink paintings are painted with normal brushes, you can actually use any ink you want. There are inks that are marketed as Chinese ink and those should be suitable.
Do not get any inks with shellac because the ink will dry hard on the brush, even after you wash the brush thoroughly.
If it's just ink painting without mixed media, it doesn't matter whether the ink is waterproof or not. Just that waterproof inks are usually (not all) lightfast and won't fade with light when exposed for months/years.
@Tobi
For inks suitable for Chinese Ink paintings, look at how the ink dilutes, more specifically what kinda of colours the black will be come. Some black ink will give a warmer (almost brown look) while others will look cool (bluish). Some black inks just dilute to a neutral gray.
Unfortunately, it's difficult to tell how the black ink will dilute unless you test it for yourself.
Since Chinese ink paintings are painted with normal brushes, you can actually use any ink you want. There are inks that are marketed as Chinese ink and those should be suitable.
Do not get any inks with shellac because the ink will dry hard on the brush, even after you wash the brush thoroughly.
If it's just ink painting without mixed media, it doesn't matter whether the ink is waterproof or not. Just that waterproof inks are usually (not all) lightfast and won't fade with light when exposed for months/years.