41. The Depth Charge Marker Mk 1 Mod 2 is similar in design and appearance to the Depth Charge Marker Mk 1 Mod 1. The Depth Charge Marker Mk 1 Mod 2 contains a hig-her purity dey, which results in a considerably more effective dye slick. Whereas the flu-orescein dye of the Marker Mk 1 Mod 1 is approximately 40 per cent pure, Depth Charge Marker Mk 1 Mod 2 contains a dye which is 86 per cent pure. In addition to this diffe-rence, Depth Charge Marker Mk 1 Mod 2 is dipped in a bakelite lacquer solution after as-sembly to insure thorough waterproofness. With the exception of these two changes, Depth Charge Marker Mk 1 Mod 2 is exactly the same as Depth Charge Marker Mk 1 Mod 1; and the information appearing in paragraphs 36, 27, 38, 39, and 40 will likewise apply to this item.