This is a blurb from the tfa website.
Hazard Symbols on Labels (6/26/2015)
What are these new symbols on my bottles?
The symbols that you will begin seeing on your labels that are diamond shaped and have pictograms of hazards inside them are 'Hazard Symbols.' As of June 1st, 2015 all companies who require a Safety Data Sheet (SDS) with their product, must use hazard symbols, statements, and warnings on the labels that correspond with the information that has always been on the SDS.
The product itself has not changed, but Federal Regulations require us to put this info (which can be found on your SDS) on all products where potential hazards are present. Be mindful that these hazards only apply to the products while in concentrated form. Once the ingredients have been diluted, it is the responsibility of our customers (you) to know the range and safety communicated to customers down the supply chain.
PLEASE NOTE: As the industry is implementing these regulations, there will be kinks, and likely changes to the labels from product to product. Do NOT be alarmed, as we are guaranteeing that the formulas of the flavors will be unaffected. Only the methods and results of the analysis will have changed. If you have further questions regarding this issue, please contact us directly.