If you've been around collectors for any length of time, you've likely heard someone mention finding or looking for chalkies. No, they're not searching for sidewalk art, they're talking about a special class of variations. Chalkies first appeared during the oil-crisis of the 1970s when Breyer was experimenting with different plastics. Modern chalkies (post-1970s) are either intentional or the result of further plastic experimentation. There are two types of models which fall under the chalky umbrella: base-coat chalky and chalky plastic chalky.
Identifying chalkies, especially from pictures, can be difficult. Even for experienced collectors there's a certain amount of guesswork and luck involved. The
Virtual Chalky Museum has a brilliant FAQ to help with identification. A model with any of the following characteristics may not be a chalky while conversely, a model without them might be chalky. If your model ticks more than one box, there's a better chance of him being a chalky. Characteristics to look for include:
Models and pictures owned by Sharon Walbridge and Damaia and used here by permission
White "halo" around rubs & speckled "roaning" effect to coloured paint