Golf ball innards

Read a book recently (about times long gone) where the author wrote about his childhood activity of cutting into golf balls and finding a sac of pink rubbery liquid in the centre of the ball. I, too, remember doing that. But I remember that we did it to try and find the little extra-bouncy rubber ball that was often the centre-piece of the surgically sliced and rubber-strip-unwound golf ball.
Are golf balls still like this? I distinctly recall the disappointment we felt when there was no little ball of "super" rubber in the centre, but the annoying little sac of pink gooey liquid.
We once sawed into a golf ball with the family's bone-handled bread knife, which ended up with a pink stain on the bone handle that remained forever. At least the pink stain on the ceiling could be (eventually) painted over.  Yes, the innards of that particular golf ball exploded rather dramatically.
How tempting it is for me to operate on the next golf ball I find...just to see if that pink liquid is still used or if there is a small rubber ball (the origin of the 'super-ball' of the 1980s, I suspect) hidden inside.