[Anon]

I wanted to make a strong bleaching cream but then I read on how to compound the solution and whew too much chemistry for me lol

What is the percentage of hydroquinone in the solution? I would figure it out but I'd need to know how many ounces you added to the bottle, not inches.

I'm interested to see what your results are. The only thing I'd be worried about is how to keep the solution stable. Hydroquinone is not stable in any water base without presence of antioxidants, so I suggest you add some l-absorbic acid to the mix. I think the batch you made is too big. It'll oxidize before you're halfway through because as I stated before, the solution is not stable in a water base. The vitamin C will also oxidize and you'll need a ton. For that not to happen the pH of the solution would have to be around 3.5 for the l-absorbic acid(cosmetic grade) to remain active. You could try lactic acid to adjust the pH but I'm not sure how that would react topically or with the hydroquinone. I guess you could use fruit based antioxidants but I don't know of any.

I just revisited some sites on making your own hydroquinone cream and it's too complicated. Hydroquinone is stable in Propylene glycol, it doesn't oxidize, even after long periods of time. These are for a 100ml solution:

• HQ 10ml + Propylene Glycol 90ml = 10% HQ Serum
• HQ 15ml + Propylene Glycol 85ml = 15% HQ Serum

Propylene is cheap. You can get like a gallon for 20-some bucks. Here are the rest of the recipes, if you decide you want a stronger solution or a bigger batch:

1. 100ml
• HQ 10ml + PG 90ml = 10% HQ Serum
• HQ 15ml + PG 85ml = 15% HQ Serum
• HQ 20ml + PG 80ml = 20% HQ Serum

2. 150ml
• HQ 15ml + PG 135ml = 10% HQ Serum
• HQ 22.5ml + PG 127.5ml = 15% HQ Serum
• HQ 30ml + PG 120ml = 20% HQ Serum

3. 200ml
• HQ 20ml + PG 180ml = 10% HQ Serum
• HQ 30ml + PG 170ml = 15% HQ Serum
• HQ 40ml + PG 160ml = 20% HQ Serum

If you need a source, just PM me.