The things that are white powder can be a number of things such as powdered sugar, cocaine, met, flour, boric acid, baking powder, baking soda, sugar, baby powder, and other drugs such as amphetamine, MDMA and sedatives such as ketamine, GHB, PCP, hallucinogense and Alpha- Methyltryptamine.
The white powder covering the oranges is clay that is used to protect oranges from sun burn and insects.
Cocaine is a white, flaky, almost shiny powder (more like flour than meth), often kept tightly wrapped in plastic bags or baggies.
White powder residue can be caused by minerals like magnesium and calcium from hard water, detergent residue, salt deposits from softened water or even dust particles that accumulate overtime.
The white powder residue can be different things depending on what it is located on and where.
White powder residue can also be signs of oxidation or corrosion on different materials.
If the white powder is on walls then the white powder could be drywall dust.
White residue on dishes is often hard water minerals.
White powdering stuff coming out of your wall is most often Efflorescence.
Efflorescence is the most common cause of white powder that occurs on walls.
Efflorescence occurs when water soluble salts in masonry or concrete dissolve in water and then migrate to the surface as the water evaporates.
As a result it leaves behind the white, powdery residue.
If the white residue is white residue that is being left on your dishes and other items after washing them in your dishwasher, it can be caused by hard water or excessive use of detergent.
Hard water contains minerals that can leave stains on your dishes.