Re: Blued Wood Screws
Pretty much anybody's guess would be valid. I've seen them used for assembling wooden items where disassembly may be required; a visually attractive screw is desired since it's exposed to view. For example, my parents had an old pump organ; the front panel just under the keys was removable for servicing the mechanism. The panel was attached with two round-headed, blued wood screws.
Being blued, it could be used with stained materials and not be visually obtrusive, as a bright, zinc-plated screw (like you get at the hardware store nowadays) would be. Bluing was an early method of rust prevention, prior to the invention of galvanizing, anodizing, or powder coating.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.