I do a fair amount of optics system design at work for medical devices so forgive me for the more complicated answer than any sane (non-geek) person would actually want

Well, a blue filter would get you part way there. For a given process, there is a graph that describes the sensitivity as a function of wavelength. Here is an example provided by Joe Smigel for wet plate with different proportions of iodide vs bromide salts. Now, compare that to a 80A Hoya filter. As you can see, the spectral transmission graph of an 80A blue filter shows a peak transmission around 440 nm and still lets some red light through all the way into the far red while an iodide emulsion has a peak out to 420 and completely insensivity at 440 and beyone. What does all this mean? It means that a blue camera filter will only get you part way there, but it may be far enough for the look you want. To really mimic the spectral characteristics you'd need a bandpass filter like those at Edmund optics.....the off the shelf filters tend to be small and very pricey.

End of long, geeky explanation...(: