Opws to katalabainw egw h skouria den einai sto nikel alla sto sidero katw apo to nikel. Otan de ka0aristei kala to metalo pou epinikelonetai h" epixrwmionetai kai anaptux0ei skouria eswterika petaei th flida tou chromiou.
Ta parapona sou sto meros pou ekane epinikelwsh.
De 0umamai an einai sto nikel h sto chromio pou bazoun mia epistrwsh apo katw pou periexei xalko gia na desei kalutera, mhpws auto einai pou blepeis san skouria; Pantws oso kai na to triyeis auto pou dixneis de 0a breis nikel apo katw.