Operation "I'm Blue"

Why didn't Blue Cars, Blue Boats and Blue Houses burn?

DEW's usually involves a laser with a color, a blue beam laser appears to be ineffective on blue material.

“The color blue is a most unusual color within the spectrum of Judaism. It was used extensively in the Mishkan and even on the High Priest’s clothing. Its most familiar use was as the color of one of the fringes of our four-cornered garments. And most mystically, in this week’s portion of the Torah, it was in the vision of the Al-mighty that Moses and the elders saw. "Under His feet was the likeness of sapphire brickwork, and it was like the essence of the heaven in purity". (Ex 24:10)”