Has anyone heard of or tried using fountain pen ink in Johanna Basford's 'grown up' colouring books (Secret Garden and Enchanted Forest)? The pictures look so whimsical and fun, and with all of the colour options that we have with fountain pen ink, it would be a blast to colour them in using a fountain pen and ink. If you haven't seen it already, check it out! I looks pretty neat: http://www.dailymail.co.uk/news/article-2981484/British-author-sells-million-copies-colouring-book-adults.html