Can I ask how the forgeries are performed? I don't expect them to alter the documents, I expect them to make a duplicate, and pass it off as original. Scan, edit, print new and improved document, sign with ballpoint.
I'm not sure how others view it, but in my business, there's genuine concern for altering letters, washing away ink, and white out. I grant you, permanent ink does not solve all those issues, but it can solve some. Simply using a fountain pen can solve the alteration to letters. Unlike ballpoint inks, even a blue or a black is different depending on whom th manufacturer is.
I still can't believe America uses checks in 2018.
I would have agreed with you until I got into my current career. I work with the age 65+ market. And while a lot of them are computer savvy, even more of them are not. I know if you listen to the tech industry, they love to say how tech savvy older people are. But personal interaction says that isn't the case. And even for those that can and even do use a computer, they really do not like to for certain sensitive matters, and money is one of them. We are at a point in the world where both old and new technologies are used concurrently. That will change, but that's where we are today. This whole forum is a good example. We are communicating with computers about a tool which is obsolete in every respect.
I, and apparently many others, never thought about the need for forgery protection related to anything other than bank checks..which are nearly archaic. As far as I'm concerned, your post validates the need for such inks for a segment of the population. No one is required to use it but, clearly, it is nearly essential for some non-imaginary market.
The strangest part of this is it isn't necessary for many aspects of the industry. Insurance is among the first to adopt new technologies, accept alternative lifestyles, and generally allow non-conformism. In the type of product I write, I usually have a choice to do it electronically or on paper. However, see previous comments regarding how seniors like to do business. So I have to be flexible. When I can pull out my Surface or iPad, I do. But if they are uncomfortable, out comes the paper. And here is where it gets tricky. Some companies allow me to fax it in. While others require the original. In either case, the original must retained for a time for legal purposes. No one wants to question a decimal point for a premium, or a signature by the son (with III) signing for the father (with II). These aren't issues you deal with every day, and carefully working with people generally avoids it all, but you still have to be prepared. Fountain pens help, and special property fountain pens help even more.
Here's the easiest rundown of what I use:
If it is just a signature, I use Noodlers Aircorp Blue-Black. It isn't permanent, but the color is not going to be duplicated by anything or anyone except another fountain pen user. I'm safe.
If it is an application with info: Noodlers Legal Lapis. Looks almost the same as Aircorp Blue Black, but it isn't going to come off.
Envelopes and checks: Diamine Registrar's Blue Black. Genuine Iron Gall ink I have in a safety pen. In winter, more than a few envelopes wind up in snow here. So this makes sure the writing survives (think I'm paranoid? I'm not).
I of course do a lot more for personal stuff. But for business, that's what I use. Add in Diamine Imperial Purple as my company's color if I'm sending a quick note to someone, and that's the business side of inks for me. Of course, four shoeboxes and one large bankers box of ink says I use a lot more when I am not working, too.