The PMI signature that separates the $9.80/kg grade from the $14.20/kg one. Both look identical.
Identical on the bench, $4.40/kg apart
Grade 2 and Grade 5 titanium are indistinguishable by eye. One pays $9.80/kg, the other $14.20/kg. Nothing about the appearance of the material tells you which one is in front of you.
What separates them
The PMI signature. Positive material identification is what puts a grade against a load of titanium; an eyeball call does not, and on this pair the eyeball call is worth $4.40/kg.
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