While laboratory tests have eliminated paint or antifreeze as the mystery fluid seen leaching into the Otumuheke Stream just over a week ago, the Waikato Regional Council is still seeking information on the bright green liquid.
Final lab results for the fluid, first reported late on Thursday (March 27), were consistent with the properties of tracer dye, said a regional council spokesperson, adding that the council was still interested in any information people may have into the origin of the substance.
Tracer dye is known as having low toxicity and is generally used to find where pipes or channels flow when this cannot be worked out through other means.
In response to LakeFM's earlier query, the Taupō District Council reported that it had not been using such dye in water pipes in the area.
The fluid was first spotted on the evening of Friday, March 21 leaching into the stream near a footbridge close to the Grandeur Thermal Spa Resort.
The stream flows down through bush to the well-known tourist bathing spot on the Waikato River at Otumuheke Reserve.
By the morning of Monday, March 24 TDC staff who were involved in checking the stream along with iwi over the weekend reported that the stream was running clear.
When first alerted to the unidentified bright green fluid the WRC urged water users and swimmers to exercise caution at the stream.
