Not 1000 ml, 1000 grams. ML is a volume measurement. Not trying to be the 'measurement police' here, but it does make a difference.
When I first started soap making, Rustic Escentuals was having a FO sale so I bought a ton of 1oz FOs. Hubby is really picky about scent because they can bring on massive headaches so when he smelled the Pearberry and loved it, I immediately bought a 16oz bottle of it. My batch was bigger...50 oz (1500g) of oils, two color swirl. Made the batter, separated it, added the color, added the FO and...it turned into concrete. What the heck?!? I destroyed the bowl when I tried chipping the soap out. Fortunately my stick blender was a two piece one so I was able to boil the 'stick' portion to get the soap off of it.
After I got everything cleaned up, I went back to the website and read the description: Severe acceleration, no discoloration.
Lesson #1 - ALWAYS check the descriptions (and reviews) before purchasing.
Lesson #2 - Regardless of descriptions/reviews, ONLY purchase a 'trial' size or 1 oz and then make a test batch.
I did find that I could use the FO in my Goat Milk Soap. I don't use colorants in my GMS and I soap at a really low temp. I still have acceleration, but working quickly I can get it poured into the mold before it sets up. Still have half of bottle of it.
And course, I'm a bit of a slow learner and did it a second time. Bought a 1oz FO, smelled it, immediately purchased a 16oz bottle. Now I did read the description where it said it contained 6.8% Vanilla and discolored to brown, but figured it couldn't be that brown since I had a FO with 9.2% Vanilla and it was a light-medium brown. But at least this time I made a test batch first. Went to check on it two hours later and OMG...it was a DARK BROWN and it smelled awful! I was ready to cry since it had cost me around $30.00 and now I would have to toss it because of the smell. But I went ahead and unmolded/cut it and tossed the bars on a high shelf. Two months later...it was still a dark brown, but the scent I fell in love with had returned.
Lesson #1 - ALWAYS check the descriptions (and reviews) before purchasing.
Lesson #2 - Regardless of descriptions/reviews, ONLY purchase a 'trial' size or 1 oz and then make a test batch FIRST and let it cure.