有關魔術..烘一烘..唔見左d字

放入雪櫃幾個鍾就得, 一晚到啦
烘返又會冇左, 果D墨水筆PILOT有出

Here's How:

Squeeze lemons to obtain their juice or obtain bottled lemon juice.
Use the juice as 'ink' by applying it to a stick or paintbrush and writing on paper.
Allow the paper to dry.
When you are ready to read your invisible message, hold the paper up to sunlight, a lightbulb (recommended), or other heat source.
The heat will cause the writing to darken to a pale brown, so your message can now be read.
Another way to read the message is to put salt on the drying 'ink'. After a minute, wipe the salt off and color over the paper with a wax crayon to reveal the message.

Tips:

Experiment with other juices. White wine, orange juice, vinegar, and apple juice all work well, too.
A cotton swab makes an excellent disposable 'paintbrush'.
The writing turns brown because the weakened paper burns before the rest of the paper. Be careful not to overdo your heating and ignite the paper!

What You Need:

Lemon or Lemon Juice
Sunlight or Heat Source
Paper
Paintbrush or Stick