Why you almost never see purple on national flags...

You have seen national flags with various colours, shapes and symbols but never a one with purple colour in it. The reason purple wasn't used in national flags was due to its high cost. Back in the day purple dye was worth more than gold because it was taken from a one species of sea snails in the Mediterranean sea. It took 10,000 of these snails to produce 1 gram of the purple dye. Purple colour garments were only worn by the people who could afford it, mostly the members in the royal families and hence purple became the "colour of royalty".

Incorporating a colour worth a fortune to a flag wasn't worthy but in 1856 the status of purple was forever changed when William Henry Perkin synthetically made purple dye. Purple became accessible to everyone after that and a handful amount of flags that were designed after 1900 have purple in them.

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How to get 90+ for GCE A/L Chemistry paper..

Well for most of the people doing A/Ls in science stream, chemistry is a nightmare, especially for physical science students. So today I'm going to tell you how to write to a chemistry paper in a much different way than you always do. Well it worked for me,and you should test this way with a model paper or in a term test before you go to exam.This saves time and also you can easily score 90+.

How to survive A/Ls in 3 months...

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Good books for students studying for GCE A/L examination...

As we all know A/Ls is a very tough exam and you will not be able to finish it successfully by just studying.It needs practice,timing and all.So the best way to do it is do exercises and improve knowledge,i did A/Ls in physical science stream and in sinhala medium,so based on my experience i will recommend anyone to use following books.There may be books better than following list,but books below were used by me. Chemistry almost every book by hemachandra basnayaka Akabanika rasayanaya by Aruna Bandara (there are two books for inorganic chemistry,these books will help you in for the doubts you will have in doing mcqs) Akabanika rasayana pilibanda gunathmaka ha pramanathmaka wishleshanaya by Ranga gunarathna(this also will help you in mcqs) Organic chemistry by jayathilaka(this book is very good and it will help you to understand concepts in organic chemistry better) Physics Prof D.D.N balo dayas' books yanthra vidyawa by lakshaman dissanayaka(questionsin this book are

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