a : something which is fashioned by casting inside a mould or form: for example (one) : a copy (as of the statue) in metal or plaster : casting (2) : a fossil replica of the details of a purely natural object by mineral infiltration b : an perception taken from an item having a liquid or plastic material : mould They produced a mask from the wax cast of her face.

from the despair scrap and junk indicate throwing absent or breaking up as worthless in existent type.

a go here : an overspread of the color or modification of the appearance of a material by a trace of some included hue : shade grey having a greenish cast