Aruba 2 1/2 florin km6 1988, 1989 different alloys?? [gelöst]

The 1988 is yellow as brass, the 1989 is more like fe-ni! Both magnetic

I have the 1988,1990 & 1993 in the same kind of dark blue carton (Muntset FDC) and all 3 with brass color, but magnetic.

I have the 1989,1991 (dark blue),1992 (dark blue), 1994 and 1996 (light blue carton) and all in the color of fe-ni, of course magnetic

I cannot see in numista that there are any other alloys than nickel covered steel?

Thanks for an answer, when you have the time to have a look
Ole

I have them from 1986 till 2003 + 2006, all from sets and they all look the same (none of them look yellowish).

Here are the 8 coins I got yesterday.

Left top 1 yellow, left top 2 fe-ni, left top 3 yellow, left top 4 fe-ni.
Same order at the bottom fe-ni, yellow, fe-ni, fe-ni.

All coins attracted to a magnet.

Strange isn't it?

Ole

Since I do NOT put even mint set coins into my collection without freeing them from the plastic covers, I just started to that!!!!

It's the plast sheet covering the coins, which is coloured and NOT the coin!

Thanks for your feed-backs.

Ole