Ink so dark it's almost purple, fit for crossing out names.
Blacklist is a black, close to purple.
It can be described as very dark, inky, gloomy and fairly saturated.
Set in white, because white reads best on it.
In computing, a blacklist, disallowlist, blocklist, or denylist is a basic access control mechanism that allows through all elements, except those explicitly mentioned. Those items on the list are denied access. The opposite is a whitelist, allowlist, or passlist, in which only items on the list are let through whatever gate is being used. A greylist contains items that are temporarily blocked until an additional step is performed.
Read on WikipediaIn employment, a blacklist or blacklisting refers to denying people employment for either political reasons, due to a history of trade union activity, or due to a history of whistleblowing, for example on safety or corruption issues. Blacklisting may be done by states as well as by private companies.
Read on WikipediaBlacklisting is the action of a group or authority compiling a blacklist of people, countries or other entities to be avoided or distrusted as being deemed unacceptable to those making the list; if people are on a blacklist, then they are considered to have done something wrong, or they are considered to be untrustworthy. As a verb, blacklist can mean to put an individual or entity on such a list. A blacklist is synonymous with a list of banned persons or organizations, and is the opposite of a whitelist.
Read on WikipediaNoun
Verb