Manufacturers always say never to mix inks unless they’re selling you a range of mixable inks, yet I have never had a problem when refilling pens that weren’t 100% clean. What are the worst reactions you ever got from mixing inks on purpose or by accident?
I don’t mix much, haven’t in years in fact, but the worst I ever got was just a really unattractive mud color when I was hoping to get a nice blue-green. In particular, FP inks should be similar enough in chemistry that switching colors without flushing shouldn’t do anything worse than make your first page of the new ink look bad.
Would love to hear stories that prove me wrong though. Wouldn’t be surprised at all if it happens fairly commonly.