Sadly I do not own a cannon, merely a cannonball. I suppose i could throw it at someone, but as far as it being used as a projectile, those days are long gone!
I don't really want to scrub too much of the corrosion off, with acid or anything, as the antique look is one of the things i like about it. And i have a bit of a confession, I was describing it from memory in my previous post, and having dug it out and having had a closer inspection it is rust coloured, so is most probably Iron. (well, the core is, the surface will be mostly Iron Oxide by now!
It's not too heavy, and certainly not as heavy as some of the rocks i've put in aquariums, and it does have a flat impact site on it so it won't roll and will spread the weight across a wider area.
I have a suspicion that a few of you have an image of something the size of a bowling ball in your heads, whereas most cannon shot were considerably smaller than this, especially the earlier ones, so i have posted a couple of pics to clarify the size of it. Thus:
It's light enough to hold in one hand with no problems, but i wouldn't want to drop it on my toes!
This is a close up of the surface, with flash. I find that taking a close up flash photo of something often gives and indication of the colour it'll look under the tank lights, though in this case i think i'll be a bit darker.
So, for putting it in the tank... Clear nail polish would be the easiest option, but would this dissolve over time into the tank, killing my fish?
I like the idea of the plastic coat, but i have no idea where i would get that done (although i'll have a look on google and my local business directories) Any idea how much that sort of treatment would cost, i imagine it's not something that the plastic shop has to deal with on a daily basis so would be a once off special (and therefore expensive?) job.
I had thought about some sort of liquid plastic coating, that could be painted on, although i have no idea if any such thing exists. I have a suspicion i may be onto a bit of a mission here!