Pigs trotter is boiled and put into gelatin
skeleton gelatin
Skeleton's Gelatin.
it solidfy by the temperature
milk
Yes, the dessert Gelatin is a type of colloid. It is a colloid because it can be easily made by adding powder to water so that it congeals.
The mixture is homogeneous.
See: Gelatin Dessert
Neither - it a colloid of a liquid in a solid.
bananas, canned fruit
Jello is a flavored gelatin dessert. There are also recipes that use Jello to make molded gelatin salads (but these have mostly fallen out of use since the 1960s, except for molded gelatin fruit salads). Gelatin is the main ingredient in Jello, and the reason it sets up.
A gelatin dessert will fail to gel if any one of these fruits is included in the dessert. Only fresh or frozen fruit will prevent it from setting. Canned fruit is harmless because the heat of the canning process deactivates the enzymes. kiwi, mango, papya, pineapple, ginger root, figs, guava, pawpaw