Question

bunsen burner safety which flame makes the glassware dirty? blue flame yellow flame invisible flame

Explanation:

A Bunsen burner with dirty glass - ware typically produces a yellow flame. This is because the presence of impurities in the dirty glass - ware or the air - fuel mixture can cause incomplete combustion. Incomplete combustion leads to the formation of carbon particles which glow yellow - orange when heated. A blue flame is produced when there is complete combustion of the gas in a Bunsen burner. An invisible flame is not a typical result of dirty glass - ware in a Bunsen burner setup.

Answer:

Yellow flame