Wax and synthetic candles are inert and will not cause symptoms. Neither coloring nor scent is present in a large enough amount to be significant. We have found no evidence that either of the two varieties of this plant is toxic. We found one source stating that the plant has been eaten without harm. The primary problems that occur are from the sharp needles, not toxic components of the plants.
Mechanical obstruction is the primary risk from ingestion.
The metallic forms of these metals are relatively insoluble in the GI Tract and are thus poorly absorbed. Acute ingestion should not produce toxicity. The bubbling fluid is methylene chloride and there is approximately 3 to 4 ml. in each bulb. When a bulb is broken with some liquid spilled and the remainder ingested, it is unlikely that a child would receive a toxic quantity. Made of thin metal, plastic, wood, glass, etc., which are of concern for their mechanical potential to cut or obstruct.