What is the difference (in layman's terms) between IFRA48 and IFRA50?

[srez]

These screenshots are from Nurture Soap for the FO Awaken. I received a sample bottle and it says to use 2.66 percent.

But in screenshot 1, it shows 6% for IFRA 48 and 2.66% for IFRA 50.

However, screenshot 2, when I ran it through their FO Calculator, it gave me a usage rate of 4% PPO.

What would you do? Go by the bottle, the calculator or the percentages shown below?

Thoughts?

 

[glendam]

The IFRA 50 is the latest and most recent update. Technically that is the one you should follow, especially if you sell your soap, but it might be too low for CP soap (Will probably be too light).

 

[srez]

Thanks @glendam Any idea as to why on their FO calculator it says to use 4%?

It's kind of confusing, to me anyway, why there's 3 different percentages.

 

[glendam]

It could be because they have not updated their calculator yet. Among the well known fragrance sellers, they were among the last ones to update their usage rate, they did it after the 50th revision went into effect, while most other sellers updated it well in advance.

Also, the IFRA percentage is based on the total solution weight. Nurture’s usage rate percentage is based on the oils weight only.

It is confusing though, not sure why they are showing both numbers. They have a Facebook group, perhaps they can help more there.

 

[srez]

Also, the IFRA percentage is based on the total solution weight. Nurture’s usage rate percentage is based on the oils weight only.

Ahhh.... That I did not know.... regarding the IFRA/Total weight. Thank you!

The Nurture/PPO I was aware of.

This is very helpful... I think... Ha!