Javanese Keris ID

[HughChen]

Hi, all

A friend showed me two Javanese Keris. They are alleged to be from 1900s (I don't know if it's ture). Can you identify them?

Why almost every Keris always be alleged to be from 1900s?

Many old Keris seems to be white but doesn't have too much red rust. Is that a valid method to identify old keris?

Another question, it's said in the process of forging, Keris will be folded 500 times. Is that real?