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Post by oaken on Sept 26, 2015 18:17:04 GMT
So how do you get that nice blue sheen on the brass when annealing? Even on brass clean from the tumbler, I seem to get just a brown smudge even on the scrappers that I heated until they glowed :-)
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Post by sako75varminter on Sept 26, 2015 19:49:52 GMT
I'm sure John will put you right!
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Post by NRA-RBL on Sept 27, 2015 14:40:27 GMT
Depends on the brass, I've just done some 7x64 RWS cases and the have a significant colour change but the Lapua .260 done straight after did not show a deep a colour change although it was clear that they reached the same temperature. If the brass is slightly tarnished you also get more of a change.
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Post by davet on Sept 27, 2015 19:15:58 GMT
I read somewhere that its down to the precise metallurgy of the brass so colour will vary I guess?
My Lapua stuff (including 260 brass) colours up a little AFTER cooling.
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Post by oaken on Sept 28, 2015 19:53:56 GMT
It is my lapua 260 brass that didn't colour up. They did come strait out of the tumbler so were very clean and not had a chance to tarnish. It's not a problem, just wondered why they didn't look annealed like when they were brand new. My 308 lap brass used to go blueish but that could be because I used to use a sonic bath which meant leaving warm overnight to dry. That may make all the difference. I suppose lapua have a carefully controlled process that gives that lovely blue look that we all expect.
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Post by davet on Sept 28, 2015 20:32:01 GMT
I just trust to the Tempilaq to show me the right temperature at neck and body and for that really clean brass works best...the blue tinge soon disappears when lubing and wiping etc!
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Post by tisme on Sept 29, 2015 4:53:14 GMT
I thought it was something to do with the chemicals burning that made the brass go blue and this will only happen once. If they are tarnished this might burn off and leve a colour. New Laupa cases do look good
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