A new client called us to look at a bright yellow stain in there white nylon carpet, caused by there tufted, wool rugs secondary backing which is a goldish tint, cotton... I did a dye transfer test with four spotters VOC, NONVOC, Alkaline and Citic acid. Color transfer occured with all four. Acidic acid caused a color change from gold to redish, others spotters the transfer color stayed the same... Think dye even transferd to dry towel, don't recall for sure.. NON of the above mentioned spotters budged the now YELLOW stain in carpet.... Since it was just a audit, didn't have Stain Magic or Red Releif with me... Question: Is there a best approach to this for removing from carpet, outside of the standard Stain Magic / Red Relief? Why did manufacturer dye the secondary backing?? P.S. I suspect client placed rug down on carpet before it was 100% dry.. Thanks in advance... Mike
When I see bright yellow stain, I first think to check for BHT yellowing. Mix citric acid powder about 12 ounces to a gallon of hot water and spray on, brush in. The color should gradually fade over 15 or 20 minutes if it is BHT issue. Otherwise I would repeat using whatever products removed some of the color and just patiently repeat as long as progress is being made.
I can't recommend a thing without a photo to see what the rug is, and the problem is. That said, IF an acid can reverse it because it's browning, I would recommend Dye Stabilizer & Rinse (by Sapphire Scientific) at 4:1 mix. It is more reactive than acetic acid (vinegar) without the odor of vinegar. Sorry I can't offer up more, Lisa
