Toxic chemicals are easily identified by the "Skull and Crossbones" pictogram under the globally harmonized system (GHS) of hazard communication. The symbol is easily recognized as a skull and crossbones.
The older-style toxic hazard symbol, which has now been phased-out, also depicts a skull and crossbones, but is instead contained within a bright orange square. Any in-house / custom labels should be replaced with new GHS-compliant labels.
The U.S. Department of Transportation (DOT) placard is used to label shipments of toxins during shipping.
Organic Acids
| Acetic Anhydride | Acetyl Bromide | Acetyl Chloride |
| Benzoyl Bromide | Benzoyl Chloride | Benzyl Bromide |
| Benzyl Chloride | Butyric Acid | Chloroacetic Acid |
| Chloroacetyl Acid | Chlorotrimethylsilane | Dichlorodimethylsilane |
| Dimethyl Sulfate | Formic Acid | Glacial Acetic Acid |
| Methyl Chloroformate | Oxalic Acid | Phenol |
| Propionic Acid | Propionyl Bromide | Propionyl Chloride |
| Salicylic Acid | Trichloroacetic Acid |
Inorganic Acids
| Bromine Pentafluoride | Chlorosulfonic Acid | Chromerge ™ |
| Hydriotic Acid | Hydrobromic Acid | Hydrochloric Acid |
| Hydrofluoric Acid | Nitric Acid | No-Chromix ™ |
| Perchloric Acid | Phosphoric Acid | Phosphorus Pentachloride |
| Phosphorus Pentoxide | Phosphorus Tribromide | Phosphorus Trichloride |
| Sulfuric Acid | Sulfuryl Chloride | Thionyl Chloride |
| Tin Bromide | Tin Chloride | Titanium Tetrachloride |
Organic Bases
| Ethylenediamine | Ethylimine | Hexamethylenediamine |
| Hydroxylamine | Phenylhydrazine | Piperazine |
| Tetramethylammonium Hydroxide | Tetramethylethylenediamine | Triethylamine |
| Trimethylamine aq. soln |
Inorganic Bases
| Ammonium Hydroxide | Ammonium Sulfide | Calcium Hydride |
| Calcium Hydroxide | Hydrazine | Potassium Hydroxide |
| Sodium Hydrodride | Sodium Hydroxide |
Elements
| Bromine (Liquid) | Chlorine (Gas) | Fluorine (Gas) |
| Iodine (Crystal) | Phosphorus |
Acid Salts
| Aluminum Trichloride | Ammonium Bifluoride | Antimony Trichloride |
| Calcium Fluoride | Sodium Bisulfate | Sodium Fluroide |