I think it is a little more complicated than indicated above. The current through a DC coil is determined by the resistance of the coil wire. On an AC coil the current is determined by the impedance of the coil. A coil designed to run on AC will generally run hotter on DC, maybe to the point of damaging the coil or the accessory. There is probably no problem with coils that are used interminently, but coils that are operated for extended periods would needed to be monitored. Another issue is with DC coils is that steel parts may become maginitized. This may result in operations that are to return to rest by gravity or light springs may not return. I think each case would need to be carefully considered.
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