The yellow fence is the work of others, and the other fence is my work. There will be some black stripes in my works. Every time I try to observe the black stripes of the fence up close, they disappear again. What are the causes of these black stripes and how can they be removed? Can someone help me?
Picture link:
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...I5kUEvPoTw!/b&bo=xQZ1AwAAAAABF4U!&rf=viewer_4
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...55.zW9PGWw!/b&bo=xQZ1AwAAAAADZ*c!&rf=viewer_4
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...5i.FhrFeoo!/b&bo=twRoAgAAAAADR7s!&rf=viewer_4
Picture link:
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...I5kUEvPoTw!/b&bo=xQZ1AwAAAAABF4U!&rf=viewer_4
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...55.zW9PGWw!/b&bo=xQZ1AwAAAAADZ*c!&rf=viewer_4
http://m.qpic.cn/psc?/V12XsYkR3C8Hm...5i.FhrFeoo!/b&bo=twRoAgAAAAADR7s!&rf=viewer_4
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