# Why do I see different color sparks from the 2 pins when I plug an appliance in a socket?

I plugged in the charger of my laptop into a socket, which I have done a lot of times but this time, I noticed a strange thing. When the contact was made between the pins of charger and the socket, there were sparks at both pins but one of them was orange and the had a blue shade. What causes the colors and why are they different for both the pins.

• "there were sparks at both pins but one of them was orange and the (other) had a blue shade". Can this observation be repeated in another turn of the experiment, or is it a one-time fluke? (Not that I would want to encourage you to repeat the sparking again and again, which could damage your charger, and/or hurt you! But this is natural curiosity.) – 299792458 Apr 29 '15 at 8:38
• Also, related : Why does it spark when I push a plug in the electrical socket. This answers why there are sparks, why sparks are colored is also trivial ($\lambda$ pertaining to ionization of specific molecules/atoms). But this question is not a duplicate, because the main issue over here is - why are those two colors different? – 299792458 Apr 29 '15 at 8:42