Dolly Llama
Number 5
the greenish/purple spot thread made me think of a situation we've encountered.
It's only happened twice that I can recall, and it's been so long ago I can't recall all the details.
but after using a hydrofluoric acid rust remover, the spots turned purple on an old green nylon com loop pile.
The other carpet i can't recall what it was, but the spots turned a greenish color.
i was told "indicator" dyes were the possible reason for the oddity.
what are indicator dyes and why/how does acid effect them?
Thanks
..L.T.A.
It's only happened twice that I can recall, and it's been so long ago I can't recall all the details.
but after using a hydrofluoric acid rust remover, the spots turned purple on an old green nylon com loop pile.
The other carpet i can't recall what it was, but the spots turned a greenish color.
i was told "indicator" dyes were the possible reason for the oddity.
what are indicator dyes and why/how does acid effect them?
Thanks
..L.T.A.