My First Comment - Inkless Printing with Colorless Color

If you have patience, read the complete article in Spectrum Magazine.
Zink: Inkless Printing With Colorless Color

Else, continue reading this :)
Currently, Printers use Ink for printing on White Paper.
However Researchers have found a way to enable Inkless Printing. They coated Paper with Organic Compounds which are colorless in crystalline state, but take different colors on melting. This color is retained on cooling. Any color can be obtained by a combination of yellow, magenta and blue. So they took 3 different Organic Compounds which turn yellow (1) at 200°C, magenta (2) at 150°C and blue (3) at 100°C respectively.

But the interesting part lies ahead.

How do they heat Compound1 to 200°C without allowing Compound3 to reach 100°C?
They use something called Fried Ice Cream Approach - If you roll Ice Cream in a dough and throw in hot oil for a short duration, dough gets fried without melting Ice Cream because you're hitting the shell with a high temperature, but the heat doesn't get to the Ice Cream.

Finally the Paper had 3 Coatings.
Compound1 which gives Yellow on melting at 200°C is at the top,
Compound2 which gives Magenta on melting at 150°C is at the center and
Compound3 which gives Blue on melting at 100°C is at the bottom.
So to get Yellow, Heat the Paper to 200°C for a shorter duration.
To get Magenta, Heat it to 150°C for a duration which is long enough to melt Compound2 but short enough to prevent melting of Compound3.
To get Blue, Heat it to 100°C for a longer duration since Heat has to cross Compound1, Compound2 to reach Compound3.

Doesn't this kindle something in our minds?
Isn't this principle used in making of several Indian dishes like Paratha, Ariselu, Boorelu?

What's my Comment?
Any Problem has a Solution. It might be in front of us or in unlikely of places. The only thing that's stopping us is determination to find it.

What's your Comment?