I've purchased very cheap some photo grade hydroquinone from cjchemical on eBay.
But when I coatted hydroquinone solution on to some white paper,
And after it was dried, It changed to yellowish stain.
When I bought some Hydroquinone using in lab or industry , It was like that too.
Is this hydroquinone scam?
Why is that appear with yellowish stain on paper?
Because I want to make my own hq cream. But I can't put it on my skin because of that dirty stain.
I want some advice.
Thanks !

Didn't you post instructions already about how to mix your own hydroquinone cream??