[China Aluminum Industry Network] Here's a simple comparison method to teach you: (1) Specific hardness, one piece of aluminum is a titanium alloy, as long as two pieces of material are drawn from each other. The scratched piece is aluminum. Because titanium is harder than aluminum. (2) Compared with acid, aluminum reacts with acid immediately, and titanium is very acid resistant. (3) Specific strength, it is labor-saving to destroy aluminum with pliers and scissors, titanium is very laborious. (4) Compared to color, draw a few aluminum on a piece of white paper and leave black scratches immediately. Titanium can't see scratches.