Vertical black lines appeared in toilet bowl

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Someone could have used an old gas pipe to feed the water supply and copper sulphide is leeching of the pipe
 
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remove lid off the cistern and my guess would be the siphon should be the twist and click style, you will find the rubber washer at the bottom of the siphon will be starting to perish and allowing a small trickle of water into the bowl, taking dirty cistern water with it, screws bolts etc that are rusty.
 

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