Hi Experts,
I am new to looking at boats, so I am looking for some advice. Sorry if this isn't the right place to post this question.
While looking at a traditional layout narrowboat, I found a small amount of fine white powder on the floor wood in a cupboard at the bow end of the cabin, and a lot of very similar powder under the bed towards the stern.
There was no evidence of water leaks at the bow end, but there was evidence that the bathroom porthole had some water ingress in the past due to discoloured wood, and less so around the porthole in the bedroom. The rear mushroom vent appeared to have been taped over inside, presumably to prevent the bed getting wet during heavy showers. The top of the base plate at the rear of the cabin appeared to be rusty - I could get my fingers down a hole and dislodge some rust around the cabin bilge pump.
I've attached a photo of the powder in the front cupboard, which isn't the greatest quality - sorry if it isn't sufficient. Sadly, I didn't have time to take a better photo, nor any of the powder under the bed which was similar. I would describe it as a very fine white powder though - and it was just a powder with seemingly no other structure.
I've seen similar on other wooden structures that are exposed to dampness outside of the boat world. So, knowing what it could be, whether I should be concerned about it, and how to treat it would be useful to know when looking at future boats.
Many thanks!