When jello ready it forms a thick layer of skin in top?

There are a few reasons why jello might form a thick layer of skin on top.

* Evaporation: When jello is cooling, the water on the surface evaporates, leaving behind a concentrated layer of gelatin. This layer can be especially thick if the jello is not covered or if it is in a dry environment.

* Refrigeration: When jello is refrigerated, the water in the jello crystallizes, causing it to become firmer. This can also contribute to the formation of a thick skin on the surface of the jello.

* High sugar content: Jello that is made with a lot of sugar can also be more likely to form a skin. This is because sugar syrup is more viscous than water, and it can prevent the water from evaporating as easily.

To prevent jello from forming a skin, you can try a few things:

* Cover the jello: When jello is cooling, cover it with plastic wrap or aluminum foil to prevent evaporation.

* Refrigerate the jello quickly: Refrigerating jello quickly can help to prevent the formation of large ice crystals, which can make the jello skinnier.

* Use less sugar: If you are making jello, try using less sugar than the recipe calls for. This will make the jello less viscous and less likely to form a skin.

If you do end up with a jello that has a thick skin, you can remove it by gently scraping it off with a spoon. You can also try warming the jello in a microwave for a few seconds to soften the skin.