Crappy plaster job. The gunnite is probably showing through.
It's all in the water generally not craftsmanship, When you add water to your pool you need to add metal which lock up particulates and allow the filter to clean them out. Also make sure your main drain is pulling most the water from the pool not the skimmers so particles do not settle out and stain
Skidmarks account for 84.7% of all brown marks in a toilet bowl . Followed in a distant second place by Iron in your water.
Why do track marks look brown
Time and bacteria can sometimes leave marks on coins.
i really dont know
Red, unless it has any stains or burn marks on it.
Milton ... the cure all for impossible stains and marks
It depends, sometimes if you do lots of exercise, and get all sweaty, brown wet marks appear in your pants, this is not a problem and is completely natural. Sometimes you are ill and it comes out without warning. Mostly, if you sit down most of the day, like at school, your pants go up your bum and get poo stains, this is rather common and there is nothing to worry about.
vascular malformation.Port-wine stains. These flat, pink marks progress to raised, dark red-to-purple grape-like lumps distorting the facial features, arms, or legs.
You can dampen a wash cloth and add a tiny bit of fabric soap and make tiny circular motions on any dirt or grass stains to release stains or marks.
Dark brown.
Your period..............maybe or skid marks
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