Prepare 2% OsO4 in cold acetone?

I want to prepare 2% OsO4 in cold acetone for TEM. But, I only have 4% OsO4 in H2O. How to prepare?Please help me or:I want to prepare 2% OsO4 in cold

I want to prepare 2% OsO4 in cold acetone for TEM. But, I only have 4% OsO4 in H2O.
How to prepare?
Please help me

or:I want to prepare 2% OsO4 in cold acetone for TEM. But, I only have 4% OsO4 in H2O. How to prepare?Please help me

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