This corrugated steel sheet, which will stick to a magnet, can be indistinguishable by appearance from corrugated aluminum. Green Earth recycling kiosks do not accept any magnetic (ferrous) material.

Extruded aluminum, commonly found in sliding doors/window frames, is worth more than other grades of scrap aluminum. Green Earth Recycling Kiosks cannot accept any door frames containing glass

Aluminum scrap is worth more if all screws or non-aluminum foreign weighty objects have been removed before the material is presented to a Green Earth Representative.

Copper #1 is clean copper scrap; Copper #2 is copper scrap with solder joints, or heavy soiling/ plating/lacquering/brazing which cannot be easily wiped off by hand. “Hair wire”, or wire whose diameter is less than that of a pencil lead, is also classified as Copper #2.

The most valuable item in the copper scrap family is “bright and shiny” stripped wire, whose individual strands are at least as thick as a pencil lead. If stripped wire is not bright and shiny by appearance, it becomes classified as Copper#1 (as long as its individual strands are sufficiently thick).

Pricing for insulated copper wire is determined by ascertaining the percentage of copper by volume, and multiplying that percentage (less handling fees) by the applicable market price for copper (either #1, #2, or bright and shiny).

Clean brass is free of any encumbrances, including (but not limited to) die-cast pot metal handles, steel springs, solder joints, attached copper, or any non-brass material.

Stainless steel is often mistaken for aluminum, but can be quickly differentiated on the basis of weight. "400 series" stainless steel is magnetic- Green Earth Recycling Kiosks can only accept “300 series” non-magnetic stainless steel. Stainless steel is also easily differentiated from aluminum on the basis of both color and weight-stainless is generally gray, while aluminum is comparably white in color; stainless is also generally much heavier than aluminum.

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