Sakura Souffle pens feature a unique 3-D ink that leaves a pastel raised line you can see and feel! They can write on regular paper as well as non-porous surfaces like plastic, glass, and metal.
They look great on white or colored paper, and their colors stand out particularly well on dark surfaces. The ink is waterproof on most surfaces, water-based, odorless, and AP certified non-toxic.
For best effect, write slowly to allow a thick line of ink to form and allow the ink to dry completely, which can take up to 10 minutes on most surfaces. Because the ink is thick and slow to dry, it is not ideal for extended writing. The raised effect works best on non-porous, clean, smooth surfaces and can be crushed down by pressing on it.
LEFTY TEST: F
Very messy. Proceed with caution!
The "Lefty Test" is a grueling process of writing with a particular instrument and then immediately attempting to smudge it. Lefty Tests are conducted on pages from the Shorthand Standard Notebook. Other paper qualities may yield varying smudge results.
A+ NO smudge
B A slight smudge; maybe needs a second more to dry
C Significant smudge
F Hard fail