Klaus, you can lighten the stain on a blade by rubbing it with the inside of the lime skin and frequent rinsing with water.
You can also simply remove the too dark stain with steel wool and sink cleaner, and start again.
What you cannot do is produce a high contrast finish from low contrast material.
I strongly suspect that even if your blade were to be stained by an expert, you would not achieve a high contrast finish.
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