Can anybody identify this clay? One of my friends found a bunch of clay in their basement, still sealed, but outside of the original package. However, I am unable to figure out what kind of clay it is. I've checked the EberhardFaber site, but they no longer seem to sell this specific type, or I simply can't recognize it because it's outside of the original package.

Things I've tried:


Airdry it, it's sat for a day without looking like it'll harden in
the slightest.
Bake it for a few minutes on a high temperature, the clay goes runny and melty.
Bake it for 15 minutes on a lower temperature, the clay also goes slightly goopy. Does not harden after cooling down again.
This is non-hardening plasteline, also known as plastecine. 

For the record, although it is labeled as children’s modeling clay, I do not trust it to be non-toxic. Having worked with exactly this product in the past, I did find it to be great when building seals in damming walls of casting molds. If you want it to be harder, you can cool it / freeze it. This will not harden it, as you are only performing a state change in the oils / paraffins that are used to keep the mass malleable. I would be very cautious of overheating it, as you are likely to generate toxic fumes.