Much easier way to dispense stubborn ketchup. Remove the cap, tilt the bottle approximately 45°, and tap the raised “57” on the lower part of the neck on your opposite hand. Preferably the large knuckle that attaches the index finger to your hand. If you don’t use the “57” brand, it works just as well with other brands. Tap in the same location. Much more control and no dealing with a messy cap that’s covered in ketchup. Squeeze bottles need not apply. Also, notice on the label in restaurants that it usually says “Restaurant pack.” This means a slightly watered-down version of home ketchup. Should be easier to dispense in a restaurant than at home.
Thanks for Michael Torrice’s Newscripts column “The ketchup problem” (C&EN, March 13, page 80). I’ve recently come across two short poems that illustrate the problem from real-world experiences.
The Catsup Bottle, by Ogden Nash
First a little
Then a lottle
Going to Extremes, by Richard Willard Armour
Shake and shake
The catsup bottle.
And then a lot’ll.
It seems that the Nash poem was first in time (as far as I can find out), and the poem by Armour was written shortly after Nash’s. My spell-checker has apparently never read the Nash poem, as I had to work hard to get it not to change “lottle” to “little”!
Lake Luzerne, N.Y.
Maybe you didn’t realize such yield-stress fluids are known as non-Newtonian fluids. They have interesting traits and uses.
Spinning a small dowel (think pencil if you still have access to one) in a Newtonian fluid will create a region around the dowel devoid of liquid. Spin one in ketchup, and the ketchup will climb up the dowel.
Try with a variable (low)-speed ¼-inch chuck drill.
Practical use: Additive for aircraft fuel as a safety component. In case of crash, regular fuel can create a fine dispersed mist, which is highly flammable and possibly explosive. But adding a polymer that acts as an antimister enables “safer” crashes. (Helo shot-down casualties in Vietnam frequently involved “survivable” crashes but for rapid fuel fire involvement.) The key requirement for the fuel is that it must still function as a fuel in engines. Do it right, and the fuel flow dynamics acts as a high sheer (yield stress) environment, allowing fuel flow to the engine to proceed as normal.
Your friendly local experimental physical chemist,
Silver Spring, Md.
March 13, page 44: In the pharma outsourcing cover story, case study #3, the structure of the tetrahydrocannabinol-valine-dicarboxylate derivative shown is the hemimalonate, rather than the hemisuccinate as intended. The structure is missing one methylene in the side chain.
April 3, page 11: In the science concentrate about making pentanediol from biomass, the final structures in the reaction scheme were short one carbon atom, showing 1,4-butanediol rather than 1,5-pentanediol.