NGC Encapsulation & Conservation 2

Question 1

What material is used to make NGC's tamper-evident coin holders (slabs)?

Accepted Answer

Polycarbonate plastic

Answer

NGC slabs are made from inert polycarbonate plastic, which is chemically stable and does not off-gas harmful compounds onto coins.

Question 2

Which of the following is a primary reason NGC encapsulation is considered conservation-grade?

Accepted Answer

The holder is airtight and uses inert materials

Answer

NGC slabs use inert, non-reactive materials and a sealed environment to prevent atmospheric contaminants from reaching the coin's surface.

Question 3

When removing a coin from an NGC slab for re-examination, what is the correct first step?

Accepted Answer

Score and crack the slab at the seam carefully

Answer

The accepted method is to carefully score and crack the polycarbonate slab along its seam to extract the coin without damage.

Question 4

What does the term 'environmental damage' refer to in NGC's grading context?

Accepted Answer

Damage caused by exposure to chemicals, moisture, or improper storage

Answer

Environmental damage in NGC's context refers specifically to coin surface degradation caused by exposure to chemicals, humidity, or reactive storage materials.

Question 5

Which conservation treatment does NGC consider acceptable before encapsulation?

Accepted Answer

Removing loose surface debris with a soft brush

Answer

Gently removing loose debris with a soft brush is acceptable conservation, while chemical dips, polishing, or coatings are considered alterations.

(NGC) Numismatic Guaranty Corporation Certified Professional Practice Test

(NGC) Numismatic Guaranty Corporation Certified Professional Practice Test

NGC Encapsulation & Conservation 2