I guess it’s been a while, but it was news to me when I found out Ivory Soap bars no longer floats. I know it was really mostly a marketing gimmick (“So pure it floats”) since it was really just air whipped into the soap before going into the molds. The bars tended to feel really light for the size. But as a kid who preferred baths, I always liked that I didn’t have to search for the bar at the bottom of the tub.
ivory.com
There have been some complaints that the soap itself has changed, but as far as I can tell it’s still saponified palm oil and palm kernel oil like it’s been for decades. At least from the ingredient list since I haven’t bought any of the new stuff.

Our Heritage
It may be a simple formula, but staying true to a promise has kept Ivory pure, clean and gentle for seven generations.

It isn’t an overstatement to say that Ivory soap – one of P&G’s iconic brands and very first products – changed the world. Today, we may not think about the benefit of having soap that floats. But in the late 19th century, when people were still bathing in the murky waters of local rivers and streams, a soap that floated was revolutionary. Since we are now bathing in tubs/showers, a floating bar is no longer necessary.
There have been some complaints that the soap itself has changed, but as far as I can tell it’s still saponified palm oil and palm kernel oil like it’s been for decades. At least from the ingredient list since I haven’t bought any of the new stuff.