* Homogeneous mixtures have a uniform composition throughout. This means the components are evenly distributed and indistinguishable from one another.

Let's break down each option:

* A. Permanent press fabric: Fabric is a complex material with fibers, chemicals, and possibly finishes. It's not a uniform mixture.

* B. Glue: Glue is a solution where one substance (usually a polymer) is dissolved in another (often water). It's a homogeneous mixture.

* C. Vinegar: Vinegar is a solution of acetic acid in water. It's a homogeneous mixture.

* D. Gelatin: Gelatin is a protein that dissolves in hot water, forming a homogeneous solution.

Therefore, permanent press fabric is the only option that doesn't represent a homogeneous mixture.