Colour of sparks.

[Rampage]

With regard to lightswitches, some people claim to see a blue spark while for others it's green.
Why?!

 

[Bubblecraft]

Probably just a blue/green colour deficiency. What you may think is blue may be green to some other people like aqua or turquoise

 

[Knobhead]

It could be the metalic composition of the contact points. Eack metal will give off a different spectrum in an arc.

 

[Knobhead]

When I read the thread title I was a bit worried about the content.

 

[snowhead]

When I read the thread title I was a bit worried about the content.

Were you thinking everything may not be black and white?

Re. O.P, ask a group of people to describe the same colour, whether sparks or not and you'll get varying answers.

If it's blue sparks, it's probably directly viewing the arc.
If it's green it's filtered thro' the plastic in the switch.

 

[Rampage]

Interesting. I was wondering if it had more to do with people's eyesight.

 

[ruston]

Yes if you hit a bit of galvanized with the mig you get a nice greenish glow, mind you that will be distorted through the shield.

 

[Knobhead]

The foundry I worked at used spark spectroscopy to analyze the composition of the metal we produced

 

[Guitarist]

If anyone saw the program "Do you see what I see", I'm sure you'd agree that it was a real eye-opener...

 

[sparks1973]

Yes if you hit a bit of galvanized with the mig you get a nice greenish glow, mind you that will be distorted through the shield.

aye...and a nice shower of spatter to go with it n all....not to mention the `galv flue`...lol...