Invisible ink invention that will surprise you
Donna Coutts,November 11, 2019 6:45PM
Kids News
There are still situations in which it’s important to send a secret message on paper, rather than by digital communications. There are still situations in which it’s important to send a secret message on paper, rather than by digital communications. Scientists have discovered a new kind of invisible ink. It’s called water. And all you need for this secret-messaging substance to work is to write with it on a super-hi-tech piece of paper coated with a chemical that includes a mineral called manganese.
Shine a UV* light on the coated paper and the water message becomes visible.
Supplied Money Bottled water, generic, shopping. With the hi-tech, chemically coated paper, pure water becomes invisible ink that is able to be read under UV light.
When the message has been read and needs to be hidden again, get out your hairdryer, blow some warm air on the paper, the message is erased and the paper can be reused, which keeps costs low.
The chemicals on the paper absorb and emit* light and the scientists found that putting water on the paper disrupted the structure of the chemicals it was coated with. The water writing showed up as darker than the surrounding paper under ultraviolet light.
Using hot air from a hairdryer for 15-30 seconds, they were able to reuse the special paper up to 30 times because the heat reorganised the chemical structure of the paper coating.
Without the heat from a hairdryer, the message stayed visible for up to three months.
Supplied Editorial Shop Smart, Thinkstock pic for Beauty Spot
Hot air from a hairdryer for 15-30 seconds completely wiped the message from the special paper and it could be reused.
The invention was by a group of scientists in China, led by Qiang Zhao of the Institute of Advanced Materials, Nanjing University of Posts and Telecommunications. Details have been published in the journal Matter.
Although much of modern communication is digital, there are still sometimes situations in which it is important to send messages on a piece of paper, such as when the recipient* doesn’t have internet access or a secure electronic device.
Invisible inks have long been useful for sending secret messages but the problem has always been how to dispose of a message once it has been revealed so no one else can read it.
Previously, the most readily available invisible ink was lemon juice.
Write with the lemon juice on regular paper, iron the paper with a hot iron and, voila*! the hidden message appeared.
The downside was that the paper had to be destroyed to hide the message so no one else could read it.
GLOSSARY
- UV: short for ultraviolet
- emit: give off or give out
- recipient: person receiving
- voila: pronounced vwah-la,a French word that is commonly used in English and means “there you are”
AADHAAR ENABLED BIOMETRIC ATTENDANCE SYSTEM
Aadhaar Enabled Biometric Attendance System Installation Manual- Download and Install RD Service of your device on Android/PC
- Restart you Android Device/PC and Install BAS Client APP
- Connect your device to Internet and Choose your State, then ask for Device activation Code from your Nodal Officer, authenticate the code by typing in the desired box and provide Biometric of Office Admin to activate the Device.
Note: IF the above BAS Client does not work then download the UNIBAS Client and install on your Windows device.
A Launcher Home for AEBAS Devices Click here to download
Most Common Computer Problems and their causes
Slow in Responding: When you delete files and Uninstall Applications from your computer they’re still on your computer taking up space of HARD DRIVE. Another reason your computer may be running slow could be due to low hard drive space or not enough RAM
Laptop Overheating: Overheating can cause all sorts of computers problems even hardware failure or burn. Overheating could be caused by poor ventilation, dying fans or even excessive use of the computer.
Odd Noises: Strange noises may be caused by a dying fan, dusty fan, Optical Disk Drive or a failing hard drive. A fan is an easy fix and often times you can back up your information from your hard drive before it fails or with the use of a recovery software.
Freezes: The “blue screen of death” is when your PC freezes in a blue screen with an error message. This could be cause by overheating, hard drive failure or a buggy software.
Computer Won’t Turn On: This is a lot of people's worst nightmare, you hit the power button and nothing happens. This could be caused by number of things. It could be something as simple as a loose cord, Motherboard failure or as serious as the power supply going bad.
Computer Turns ON but no Display: This could be possibly due to the RAM Error i.e. the power data-contacts of RAM get dirty and dusty and dirty RAM Slots. Remove RAM and switch slots, Wipe the metal contacts of RAM and Blow air into RAM Slots can be helpful.
Computer Turns ON but no Display: This could be possibly due to the RAM Error i.e. the power data-contacts of RAM get dirty and dusty and dirty RAM Slots. Remove RAM and switch slots, Wipe the metal contacts of RAM and Blow air into RAM Slots can be helpful.
Odd Noises: Strange noises may be caused by a dying fan, dusty fan, Optical Disk Drive or a failing hard drive. A fan is an easy fix and often times you can back up your information from your hard drive before it fails or with the use of a recovery software.
Freezes: The “blue screen of death” is when your PC freezes in a blue screen with an error message. This could be cause by overheating, hard drive failure or a buggy software.
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How to Remove Write Protection from USB Drive or Memory card
Some times, USB flash drives or memory cards get read only write protected error, i.e. you can’t copy data in to the USB drive. To solve this issue, here we are sharing some methods to remove the write protection from pen drive or memory card.
disk-write-protected
Error : The disk is write-protected. Remove the write-protection or use another drive
There are many reasons that cause this problem, let’s see solutions…
Method 1: Check for a Physical Switch
Some USB drives and Memory cards have a physical locking switch that allows you to lock drive and prevent any changes. Examine the USB drive or Memory card closely. If you can find the switch, switch it to the other side to turn the protection off.
Method 2: Scan with Updated Antivirus
The problem can also be caused by some virus activity, so just get it scanned by some updated good antivirus software which may solve your problem. If you don’t have an updated antivirus, Use free Kaspersky virus removal tool.
Method 3: Check Security Permissions
Right click the USB drive and select properties in the explorer windows.
In the properties window, select the security tab.
Select the ‘user’ under user name and click on ‘Edit’.
Check if you have Write permissions. If you don’t, check the option “Full” for full permissions or “Write” for write permissions
Method 4: Using Registry Editor
Open Start Menu
Run, type regedit and press Enter, this will open the registry editor.
Navigate to the following path:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies
P.S. If you can’t find the key StorageDevicePolicies , go to step 6.
Double click the key Write Protect in the right pane and set the value to 0 In the Value Data Box and press OK button
Exit Registry and reboot your pc
If you can’t find the key StorageDevicePolicies in step (3) you have to create it manually.
Right-click HKEY_LOCAL_MACHINE\SYSTEM\CurrrentControlSet\Control\ and select New -> Key.
Enter the name StorageDevicePolicies.
Click on the new registry key StorageDevicePolicies and on the right pan right-click, select New > DWORD and give it the name WriteProtect.
Double click on it and set its value to 0.
Restart your system and check it.
Method 5: Using Diskpart (command prompt)
Start > search bar -> CMD and press enter
Type< diskpart
Type< list disk
Type< select disk # (# is the number of the USB DRIVE you’ve plugged in )
Type< attributes disk clear readonly
Type “exit” to exit the diskpart
Method 6:Format your USB Drive
If the above methods do not solve the problem and still the usb drive is write protected, then
you can execute a “low-level format” on the drive.
Download HDD Low Level Format Tool to perform the “low-level format” of your USB drive.
After completing the low level format you may have to create a partition in that disk drive.
For that :
Run diskmgmt.msc in Run.
In the disk management window, select the pen drive, right click on it and click on Format.
Click OK. That’s all
Hope one of the solution may help you to remove Write Protection from your USB drive or memory card.
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Remove "Downloading English xxxxx Waiting for wifi" from notification in Xiaomi MIUI
Open Settings -----> Additional Setting---> Language & input ----->Text-to-Speech Output----> tap on Setting (GEAR) Icon ----> Install voice data ---> Choose language as mentioned in notification ----> download the language
Tap on settings for text to speech engine and disable USE WIFI ONLY
Alternate method (if the above method not work)
Open Google App swipe from left to right and open settings then tap on VOICE and choose OFFLINE SPEECH RECOGNITION and download the language. YOU ARE DONE....!!
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