How to dispose of gasoline

Mirrors are made up of two parts, the glass and then a reflective coating on the back. Because of this, they are not considered 100% glass and many times the town's recycle pickup (if your have one) for glass will not take them because there will be an additional process to separate the glass from the reflective material backing.

Possible disposal methods:

• Throw it out. We have a recycling/trash center in our town and for a fee you can dispose of bulk items that the trash guys will not pick up. A mirror of that size would be considered a bulk item.
• Recycle. Check your local recycling center, some of them will recycle mirrors at no cost.
• Repurpose. The mirror could be reused by someone else as is if it is good shape. Some advertisement may be necessary in local media, or you can use free advertising as indicated below in the comments by @Steve.
• Donate. A mirror or especially a broken mirror can be reused for many arts and crafts type projects like a mosiac. Check with schools/university or with any local artisans, they might take it off your hands.

Finally, in thier spare time one could create a funkadelic disco ball from the mirror and then sell it on eBay for a small profit.

The municipalities just don't want it liquid or with the lid on. Imagine a paint can full of paint when the compactor squishes down on it. Paint everywhere! You can put whatever you want in the paint to make it more solid. Kitty litter, the store bought stuff drying agent, sand. I have used some old mortar that I had on hand. You just want to make sure that it's a solid or semi solid, and you can put it out on the curb for pickup without worry of it spilling with no lid. It would take too long for it to air dry. Also, a film might form on the top, preventing the bottom from drying.