OK...At the request of at least two of the moderators/staff I will expound on the uses of Carbide.
Back in the old days the miners, both hard rock and coal, used carbide lamps to illuminate their way while under the earth.
With the invention of the battery came the modern cap lamps and away went the cabide lights.
Living in SW PA we have lots of Coal mines and miners and Carbide well known around here.
Somewhere along the way...a smart fella took his old carbide lamp and discovered that when lit the flame gave off a nice black soot. OK lets smoke the front sight post on our rifles and see if we have better sight aquasition...sure enough the fella started shooting better scores and a new product was added to the shooters tool box.
Calcium Carbide is reactive with water to produce the common gas we know as acetylene. Calicum Carbide is how acetylene is made today. CC is hard to get these days.
The modern sight smoker is used widely throughout the CMP/NRA shooting world and the best smoker is made by Ray-Vin. I actually used my old carbide lamp to smoke my sights, before I went to Camp Perry this year and got my super smoker.
I originally posted the ad under Competitive Shooting forum cause I knew the guys there knew what a smoker was and what the carbide was used for. I was told to move it to the EE....thus the guys seeing the ad and scratching there heads.
But that's OK...now the AR plinkers and blasters know how to blacken their sights when they decide to get serious about shooting.
Hope this helps...
Have a great Holiday weekend and keep'em in the 10 ring. .....that's the center of the target for those of you from Rio Linda CA.