Short answer is that you will destroy lung tissue. Not sure if you mean HCl in aqueous solution or HCl gas. In the latter case, whether or not it is fatal will depend on how much you inhale, but you wonât need much. It will also harm the nose and throat. If it is dilute solution it will be a bit like choking on regurgitated stomach acid and could cause long term health problems.
Peelaway 7 Paint Remover is a suitable for use on all woods with more modern paint or varnish on. Both of these products are a paste like product that you leave on for 24/48 hours (depending on what the test area shows) and then peel off.
Unless the acetone dye was not properly applied, an acetone-dyed floor will have a sealer to protect it. You can paint over the sealer but will get better results if you remove it. Removing sealer is not an easy task. You can physically remove the sealer via grinding or a method called shotblasting. But using a chemical stripper is a more common method. Chemical strippers soften the sealer, allowing you to scrape it off.