1.   Blue flames were running up and down the wires, and blobs of melted plastic insulation were dripping down.

2.   Natural gas burns with a bright blue flame.

3.   She ate dinner alone before a fire made of driftwood that sent salty blue flames leaping up the chimney.

4.   The gas was given its name because steam is used in its preparation and because it burns with a bright blue flame.

5.   The pipe was filled with water, heated over a blue flame and a small quantity of the substance placed in.

6.   He set her on her feet suddenly, his eyes like blue flames in his taut face.

7.   A stroke of the blue flame swept the bare ground.

8.   Also make sure the pilot light is burning with a blue flame.

9.   But he burns with a clear blue flame, as the true-blue lefty in the field.

10.   Day said a ventless fireplace should produce an even blue flame, and the presence of any soot is an indication of potentially serious problems.