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Chapter 29

How Temperature and Humidity Affect Cards

Paper and foil materials change shape based on environmental conditions.

Humidity Problems

warping

foil oxidation

surface stickiness

micro-swelling

mold risk

Dryness Problems

cracking

brittleness

corner flaking

edge fiber exposure

Temperature Problems

bending from heat

foil separation

adhesive softening

ink discoloration

AGS Measurement

AGS laser systems detect:

warp curvature

foil lift

microscopic bending

Tips:

Store cards around 68–72°F

Humidity 40–55%

Avoid direct sunlight

Avoid basements/garages

Environmental care significantly influences grading outcomes.