Chemicals

CuNH₄Cl₂

ammonium copper (II) chloride or ammonium chloride

What is CuNH₄Cl₂ used for?

Etching agent

CuCl₂

copper (II) chloride or cupric chloride

What characteristic does CuCl₂ have that is beneficial to serial number restoration?

corrosive to aluminum

NaOH

sodium hydroxide

True or False: NaOH is very corrosive

True

HCl

hydrogen chloride

HNO₃

nitric acid

What characteristic does HNO₃ have that is beneficial to serial number restoration?

serves as a highlighter

H₃PO₄

phosphoric acid

What characteristic does H₃PO₄ have that is beneficial to serial number restoration?

corrosive to metals

Aqua Regia

nitrohydrochloric acid

What does aqua regia stand off?

“royal water”

Aqua regia is a mixture of what chemicals?

HNO₃ & HCl

What is the ratio of HNO₃ and HCl in aqua regia?

1:3 molar ratio

What characteristic does aqua regia have that is beneficial to serial number restoration?

powerful oxidizing agent, that dissolves gold & platinum

True or False: aqua regia will also dissolve other metals in addition to gold & platinum

False

True or False: aqua regia must be used in the fume hood

True

H₂SO₄

sulfuric acid or hydrogen sulfate

FeCl₃

iron (III) chloride or ferric chloride

What is FeCl₃ used for?

etching metal

HF

hydrogen fluoride

What chemicals are best for aluminum alloy?

NaOH/nitric acid or phosphoric acid/nitric acid

What chemicals are best for zinc alloy?

FeCl₃/nitric acid or phosphoric acid/nitric acid

What reagents are available in our laboratory for ferrous metals?

Davis, Turner’s, Fry’s

What reagents are available in our laboratory for non-ferrous metals?

Ferric chloride, acidic ferric chloride, 2-Step Phosphoric/Nitric Acid & sodium hydroxide