You could pour some in a shallow pan and light it. Will smoke a lot. Probably burn with few ashes. Repeat until it is all gone.
For fun put a little in a soup can and try to light it. Unless the can is full it won't burn. If the can is full it will extinguish before it goes very far.
Most cities/counties have a hazardous waste disposal facility. Look them up, often free for casual citizens, charged for businesses. For example I can dispose of used tires at my county commissioner's office for no charge, as long as I am reasonable. Can't bring a truck load in.