Portland Razor Co. blades are made of 01 tool steel, a high-carbon steel with excellent edge retention, workability, and good corrosion resistance. It is not, however, a stainless steel and requires some special care.
Keep your straight razor clean and dry between uses.
Strop it well between uses. This keeps the edge keen, and clean of debris that can cause corrosion on the blade or irritation on your skin.
For long-term storage, apply a very thin coat of light oil (camellia is recommended) or Ballistol and wipe off the excess.
Store in a breathable/moisture-wicking container. PR has nice merino wool sheaths available for purchase, but a sock will do! Do not store straight razors in a leather sheath long-term.
Using your straight razor regularly is the surest way to make sure you are cognizant of its condition. Inspect yours frequently to assure that it is always ready to perform!
Finally, store your straight razor out of reach of children.