Nur Fur Deutche Sign

I have a wood sign that reads "Nur Fur Deutche". I’m 99% sure that it’s original; however, I’ve seen a very similar one being offered for sale on a website and they make a statement about the method used to create the sign, that I’m unfamiliar with. I was hoping someone could shed some light on it for me. As you will notice in my pictures, there is NO blue residue in the letters. The website claims they’re sign IS original and as proof makes this statement
"Very important detail: the text is made by chemical pencil which was produced only before and during WW2 period. Difference between chemical and regular pencil is what the chemical pencil after contact with water changed his colour to blue (see text on the sign) – regular pencil does not change the colour." I’ve included ONE picture of the one from the website for comparison.

I would appreciate any information you might have.
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