Bark for garden mulch

[Atalah]

I wonder if you could use bark that isn't advertised as fir bark for orchids, but bark in 40 liter bags meant as mulch for the garden. I have a bag, it's not overly expensive, I could use it to mulch my blueberries, but I would like to use some for my orchids as well. A lot of the bark is easily recognized as fir, but the bag doesn't say what type of bark it contains.

Right now I'm keeping a portion in an open bag so it can dry out a bit. I hope that I can rinse the dirt of when I need to and that it won't be too time consuming making chips in the size I want. ...Assuming it's regarded safe to use that is