It can turn some red dyes to bright blue.
Mysterious dark spots on carpet.
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Acids pink or orange spots on carpets are caused by as little as 1 hydrochloric acid in solution.
The spots were in fact oxidised apple juice which had been sprayed onto the carpet by children from some strange looking drinking vessels.
I don t recall this spot encountering any particular moisture so i m not sure what could be causing the spots.
Starting in a hidden or at least not obvious area of the carpet mix 1 cup of distilled white vinegar into a1 gallon of warm water and spray the carpet test area evenly enough to wet the top of the carpet fibres.
There it soaks up soil dirt and bacteria in the pad and then through evaporation it pulls all of the soil to the surface of the carpet.
It could have been colored pencil lead or some other marking material.
The most likely cause of the blue spots and they could have been any color is the introduction of a substance that when wet ran and dyed the carpet.
A very effective general stain remover is a mixture of 2 tablespoons of salt and a cup of white vinegar.
If you like the result you can try a larger area.
Let the area dry and then vacuum the area.
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Sometimes these line up lengthwise or widthwise one instance or more and sometimes they just appear randomly.
I pre treated the entire carpet with prochem b175 agitated and allowed 20 minutes dwell time.
Apply the mixture to the stain with a cloth.
This dirty moisture then creates the brown spot in the middle of the carpet.
Let the carpeting dry check for a color change.
Start as a small dark pencil eraser sized dot in the carpet.
Here are three vinegar solutions that can help you take out tough carpet stains.
The most likely agent would be a material that was in a powdered form that clumped and fell onto the carpet.
The moisture permeates into carpet fibers and seeps down into the carpet pad.
I have some dark grayish spots appearing on the tan carpet in my living room see pic.
The affected area is about 10.