It's impossible to say for sure what the powder is based solely on its color. There are many possibilities, and it's important to never try to identify unknown substances based on appearance alone.

Here are some examples of what it could be:

* A mixture of two substances: One white and one blue. For example, it could be a mixture of salt (white) and crushed blue food coloring.

* A single substance with varying colors: The blue color could be from impurities or variations within the substance.

* Something hazardous: It could be a chemical compound that is harmful if inhaled or touched.

To determine the substance, it's crucial to:

1. Avoid contact: Don't touch or smell the powder.

2. Seek professional help: Contact a chemist, lab technician, or other qualified expert. They can safely identify the powder and provide instructions on how to handle it.

Remember: It's always better to err on the side of caution when dealing with unknown substances.