What is the best definition of a primary source document

A primary source is a manuscript, diary or document from which information can be obtained. They are original narrations written at present time by people who have had an immediate relation with the subject matter of the text. They are considered genuine and reliable sources. For example, newspaper reports, photographs, videos, letters and interviews.

the best practice

1. keep your workspace clean

2. wash your hands

3. seperate and clean chemicals and equipment

4.   use microfiber cleaning utensils

5. clean and sanitize all work surfaces

hope this !