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<p>[QUOTE=&quot;Conder101, post: 2446388, member: 66&quot;]Blacksley effect is caused from the upsetting of the rims on the planchet.&nbsp; As it runs through the upsetting mill the diameter across the planchet where the clip is is less than the normal diameter.&nbsp; This means in that area there is no pressure to create the raised rim 180 degrees away from the clip.&nbsp; So when that planchet is struck there is less metal thickness there and the strike is therefor weaker causing a loss of detail.[/QUOTE]</p><p><br /></p>

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