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10th July 2007, 12:34 PM
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#6 |
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Member
Join Date: Mar 2005
Posts: 116
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also..
- could be a difference in metal ... martensite will etch dark.. and pearlite is much lighter... ... some times an air jacket will insulate the blade in spots, when you quench it.. - blade wasn't properly degreased before etch... and it protected the blade abit from the acid...... ( smudged finger prints or oils etc ) - a light layer of decarb... left over from forge process.... it will etch very lite and show next to no pattern... or non at all - burnishing... restoring a blade an using high grit sand paper.... that becomes loded up with steel filings.... this will basically be using steel on steel and burnishing... this does reduce the pattern.... and can be localized... -sometimes an exta dunk in the etch tank will get rid of this ... as it maybe just some water on the blade that momentarily delays the etch... looks simple...but lots of things can cause this... G |
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