Homemade Soap Gone Bad

So...I'm cleaning out cupboards and came across a box of soap that looks like this.  The soap should be a pale, creamy color.  This castile soap was made several years ago and it went bad.  It's a shame to throw it away but it's considered caustic at this point and not safe to use.  It may have not traced properly or the bars didn't receive enough air during storage.  Whatever the reason, I have to toss it.