Genuine bronze is significantly heavier and cold to the touch, whereas resin-based 'cold cast' bronze feels warmer and lighter. A professional buyer should request a spectrometer metal analysis report from the supplier to confirm the alloy composition. Furthermore, genuine bronze will produce a resonant metallic ring when lightly tapped, while resin produces a dull thud. For outdoor installations, only hot-cast bronze is suitable as it can withstand UV rays and temperature fluctuations without cracking.