Welcome to the Periodic Table of the Elements power trail; which begins at Mount Henry Bridge and continues south down the freeway cycle path. Please stay safe and enjoy the power trail.
Rhodium metal is silvery white, has high reflectance, is hard and durable; and has a higher melting point plus lower density than platinum. Upon heating it turns to the oxide when red, and at higher temperatures turns back to the element. It is a major component of industrial catalytic systems.
Ruthenium, rhodium, palladium, osmium, iridium, and platinum together make up a group of elements referred to as the platinum group metals (PGM).
Source: Webelements
The original containers (placed by BlaKids & LouBla) are small tubes as shown here...
These containers have logbook inside them only, thus be sure to BYO pen.