The only thing is that the original blades that survived with their original etch were not blue but brownish. In fact, Moros used this old formula:
1. cover the cleaned blade with citrus juice (like calamansee, a type of lime)
2. place in the hot sunlight
3. wait
4. wash off with water
The result was a grey to brownish color on the laminations of the blade. Sounds similar.
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