In the top pic of your last two, the spine of the blade looks far darker than it did before.
It may be that your grinding has caused some burning of the steel. If so, you have probably removed/negated the heat treat. Did you dip the blade in any water to keep it cool?
It may be that your grinding has caused some burning of the steel. If so, you have probably removed/negated the heat treat. Did you dip the blade in any water to keep it cool?