CGL Laboratory Safety and Procedures 2

Question 1

When handling fragile 19th-century documents in a genealogical archive, which glove material is generally recommended to avoid damaging paper fibers?

Accepted Answer

Cotton gloves

Answer

Cotton gloves are preferred for handling historic paper documents because they prevent skin oils from transferring without snagging delicate fibers.

Question 2

A genealogical lab stores DNA samples at -20°C. What is the primary reason for maintaining this temperature?

Accepted Answer

To preserve DNA integrity by slowing enzymatic degradation

Answer

Freezing at -20°C slows enzymatic activity that would otherwise degrade DNA over time.

Question 3

Which of the following is the correct procedure when a photographic negative from the 1920s begins to emit a vinegar-like odor?

Accepted Answer

Isolate it from other materials and store in a vented area

Answer

Vinegar syndrome in cellulose acetate film is contagious to nearby materials; isolating in a vented space prevents spread while allowing off-gassing.

Question 4

What does 'chain of custody' mean in the context of genealogical DNA lab procedures?

Accepted Answer

A documented record tracking who handled a sample from collection to analysis

Answer

Chain of custody documents every person who handled a sample, ensuring its integrity and admissibility in legal or professional genealogical contexts.

Question 5

In a digitization lab, what is the maximum recommended optical density (lux) of light exposure when scanning iron gall ink manuscripts?

Accepted Answer

The lowest intensity sufficient to produce a usable image

Answer

Iron gall ink is photosensitive; using the minimum light necessary protects the document from cumulative light damage.

(CGL) Certified Genealogical Lecturer Practice Test

(CGL) Certified Genealogical Lecturer Practice Test

CGL Laboratory Safety and Procedures 2