How do you think magma and sediment form?

I hope this helps
When the molten rock cools it forms an igneous rock. Metamorphic rocks can form from either sedimentary or igneous rocks. The sedimentary particles from which a sedimentary rock is formed can be derived from a metamorphic, an igneous, or another sedimentary rock. All three rock types can be melted to form a magma.

The answer is joseph is observing the colour of the reaction mixture to see whether proteins are present in the given solution.