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Table 2 Preliminary exhibition recommendations for several materials of NMAH’s Ruby Slippers

From: Materials characterization of the Ruby Slippers from the 1939 classic film, The Wizard of Oz

Material Temperature, °F Relative humidity,  % Light, lux/foot-candles
Gelatin (sequin core) 50°–65° 35–50a 50–100/5–10
Cellulose nitrate (sequin coating) 40°–50° (or cooler than room temp) 40–50 50/5
Glass (beads and stones) 40–60 200/20
Paint (sole) 50°–75° 40–60 50–150/5–15b
Leather (heel) 65°–70°c 45–50 50/5
Silk, dyed synthetic (thread, fabric) 65°–75°c 45–60 50/5
Cotton, dyed synthetic (thread) 65°–75°c 45–60 50/5
  1. aDependent on temperature
  2. bEstimate based on a cellulose nitrate/alkyd paint composition
  3. cLower temperatures above > 40° are generally not detrimental