There are several brand of touch-up enamel paint for appliances. Krylon for example, it's carried by a wide variety of retailers such as Home Depot, K-Mart, Sears and Walmart.
You can also get it at store that specialize in paint like Sherwin Williams. They might also be able to give you the best match to your color. If not you can try appliance stores. They may be able to give you a good match. The only other option is to match it yourself. The best way to to that is to get some color card examples from a paint store or hardware like Home Depot and find the best match. Now get a list of the colors that they use to mix it. Ask if you can get a very small amount of the colors used in the mix and using trial and error mix it yourself.
You can also try mixing it to get your color using enamel auto touch-up paint.
There really is no source for old appliance touch-up paint so it will never be perfect but with a little trial and error you can get pretty close.
Hope this helps you out.
Prep before painting:
Sand the damaged area lightly with fine-grit sandpaper. Roughen the
area to be painted and remove any rust, but avoid sanding the
- Clean the area thoroughly with a rag dampened with paint thinner. Let dry.
- Paint over scratches with appliance touch-up paint, using the bottle's
applicator brush or another fine-tip paintbrush. Let dry overnight.
There will be issues with areas that are exposed to high heat so be prepared to repeat when necessary.