OK, So I am "Old School"

OK, so I freely admit that I am "Old School." I do some things the "old" way.  Like paying my bills. I love using my fountain pen to write checks.  I love to mail the checks as well, and yes, I know it costs me $.82 for each to mail.  I love writing addresses on the envelopes when necessary, and I really love using postage stamps.  Guilty as charged!  I am eccentric sometimes.  I get that.  So here's the story:  A good friend of ours sent a check to a charity and their bank called and asked her to come down to verify a check because it was of high value.  She was shocked to see that someone had "kited" her check and increased the value by some thousands of dollars!  Fortunately the bank caught it.  So I am aware that crooks can do that.  I use a fountain pen and I have read about special archival inks.  So I wondered if one of my checks, if stolen could have been increased in value - "kited."  I took two checks, used a roller ball, and then my fountain pen with Parker Quink black ink, and then used a ballpoint. After I let the inks dry for an hour I put some acetone in a small dish and "washed" one of the checks, as it is called.  I read somewhere that acetone had been used for such a thing.  The GREAT news is that acetone would not touch the rollerball, or my fountain pen ink.  But look at the ballpoint - I was shocked!  That ink was almost completely gone.  Notice the area circled in red where you can see that some of the ink of the check was dissolved (the check was not completely immersed in acetone).  Bottom line I am safe with my checks written with my fountain pen or the rollerball pens I have around!  I can continue to be "old school" when it comes to paying my 3 or 4 bills each month!  This is fascinating, isn't it?