I am from Vienna and i am often in the CCC.
The €1 Chip is the most used, there are more NL 1/2 tables open at any daytime.
The €10 is made of plastiv, black with 4 white spots.
The €100 is bigger (and all higher Chips too) and with 6 red spots.
The €20 seems so be khaki or light grey or something. (i never used them, sorry)
The €1000 is Pink.
The €5000 is a lighter pink than the 1000.
And the €10000 is light Blue.
The lower chips MUST be very robust, they are in 24/7 use.
The €10 that a got last was very used and i could see that the white edgespot plastic is a little bit harder than the black plastic.
I think the CCC should buy new Chips.