The phrase "a drop of cold" is not correct and does not convey a clear meaning in written English.
It could be used in a context where you are describing a small amount of something cold, but it is not a common expression.
Example: "After the long run, I took a sip of water, feeling a drop of cold refresh me."
Alternatives: "a splash of cold" or "a hint of cold".
Academic pretensions flash through like brush fire, without a drop of cold water splashed their way.
Stir in the egg yolk and a pinch of salt and, if necessary, a drop of cold water to bring it together into a dough.
Michele had jerked his head up as if a drop of cold water had gone down his back and, with a bewildered look, had made a grimace of ignorance.
She was able to levitate a droplet, delaying its coalescence, by as long as 10 seconds, by maintaining a temperature difference of up to 30 degrees Celsius, or 86 degrees Fahrenheit, comparable to the difference between a drop of cold milk on a bath of hot black coffee.
The cuvette was filled with warm water and a drop of cold water was added using a dropper.
On a RNA free microscope slide, a capitulum was cut in a drop of cold buffer with 25 mM MOPSO (pH6.3) (Sigma-Aldrich), 200 mM sorbitol (Alfa Aesar, Karlsruhe, Germany), 10 mM sucrose (Acros, Geel, Belgium), 5 mM thiourea (Sigma-Aldrich), 2 mM DTT (Sigma-Aldrich), 5 mM MgCl2 (Sigma-Aldrich) and 0.5 mM sodium-phosphate (Acros) [ 23].
The mosquitoes were dissected in a drop of ice-cold sterile DEPC-treated water and midgut from 25 30 mosquitoes was pooled in 100 µl DEPC treated PBS buffer at −70°C.
After applying a drop of ice-cold hemolymph-like saline solution, the larvae were cut open along the dorsal midline.
Migratory cells were isolated with the in vivo invasion assay, and after collection, they were extracted from the microneedles in a drop of ice-cold PBS on glass slides.
"I'll have a little glass of tap water, please, and a tiny drop of cold milk, thank you.
Dry coverslips were coated with a thin layer of FITC-conjugated gelatin and immediately overturned on a drop of 0.5% ice-cold glutaraldehyde in PBS for 15 min incubation in the dark.
