Do you know , What Our Indian Coins Are Made Up Of ?

 

METALLOGRAPHY OF COINS IN INDIA

 

1.       INTRODUCTION

Welcome Readers, here we are with another interesting blog for you in Meta Monday. India has been one of the earliest issuers of coins in the world (circa 6th Century BC). India has unique and diverse coinage techniques be it minting techniques, motifs, sizes, shapes, the metals used. Currently, there are Re.1, Rs. 2, Rs.5 and Rs.10 coins in use. While using them you must have wondered about how and what coins are made of, their metallography and design. Here are the answers to all these questions. Let’s go through them.

2.       COIN MAKING PROCEDURE:



Pic Credit: Britannica Encyclopedia

The above image shows the general procedure of making coins in India.

·         Re.1 Coin:

In independent India, one rupee coins was first minted in 1950 and is currently in circulation.The one rupee coin is the smallest coin currently in use. One Indian rupee coins are minted from stainless steel since 1992. It is made out of ferritic stainless steel, containing 83 per cent iron and 17 per cent chromium. Round in shape, the one rupee coins weighs 3.76 grams (58.0 grains), has a diameter of 21.93-millimetre (0.863 in) and thickness of 1.45-millimetre (0.057 in).

2011 Rupee Symbol Series



2007 Nitya Mudra Series



Ferritic Stainless Steel (Metal Changes)

 


·         Rs.2 Coin:

The Indian 2-rupee coin is a denomination of the Indian rupee. The 2 rupee coin was introduced in India in 1982. Until then, the Rs.2 was in circulation in banknotes. The old Rs.2 coin was minted with cupro-nickel metal. The new Rs.2 coin was minted in ferritic stainless steel.


2011 Rupee Symbol Series



2007 Nritya Mudra Series





2005-06 Unity in diversity Series



New Denominations of Rs. 2

 


·         Rs. 5 Coin:

The Indian 5 rupee coin is a denomination of the Indian rupee. The ₹5 coin was the highest denominated coin until the minting of the ₹10 in 2005. According to a research paper, EDXRF technique has been used to study material compositions of five rupees coins. Since Year 1990-2000, Cupro-Nickel alloy, from 2000-2010, Nickel Brass alloy and from 2010 to till date, Ferritic Stainless Steel (FSS) has been preferred for coin Manufacturing process. The possible reason for this material amendment could be the Clearly attributed to high cost and low availability of nickel (Ni) as compare to low Cost and easy accessibility of Iron (Fe) in modern coins. Besides these elements, traces of Mn, Cr has been also observed which act as the strengthening elements.

 2011 Rupee Symbol Series



2007-09 Connectivity and Information Technology Series



New Denominations of Rs. 5



·         Rs. 10 Coin:

The Indian 10-rupee coin (₹10) is a denomination of the Indian rupee. The ₹10 coin is the second highest-denomination coin minted in India since its introduction in 2005. The present ₹10 coin in circulation is from the 2019 design. However, the previous ₹10 coins minted before 2019 are also legal tender in India. All ₹10 coins containing with and without the rupee currency sign are legal tender, as stated by the Reserve Bank of India. Along with the standard designs, there are 21 different designs for this denomination and are minted as circulating commemorative coins, this is used alongside the 10 rupee banknote.


2011 Rupee Symbol Series



2005-06 Unity in diversity Series

 

·         Rs.20 Coin:

The government has announced new Rs 20 coin which will be shaped like a 12-edged polygon (dodecagon). The outside diameter of new Rs 20 coin will be 27mm (millimeters) and it will weigh 8.54 grams. The composition of the new coin will be 65 per cent copper, 15 per cent zinc and 20 per cent nickel for the outer ring, while the inner ring (centre piece) will be 75 per cent copper, 20 per cent zinc and five per cent nickel.

 


 

3.       A BRIEF HISTORY:

·         Metallography of metals used in Indian coins:

Gold (1835-1918)

91.7% or 22 carat.

Standard silver (1835-1919)

91.7% silver+ 8.3% copper

Silver alloy (1939-1945)

50%silver + 40%copper+ 5%nickel +5%zinc

Bronze (1906-1964)

95-97% Copper+ 4-21.7%

Silver alloy (1969-1971)

80%silver + 15% copper+ 5% nickel

Silver alloy (1972-2002)

50%silver + 40%copper+ 5%nickel +5%zinc

Copper (1835-1906)

pure copper

Copper nickel (1906-2002)

75% copper+ 25%nickel

Nickel brass (1964-71, 2009-11)

79% copper+ 20% zinc +1% nickel

Nickel (1946-74)

Pure nickel

Aluminum (1965-93)

96%Aluminium+ 4% Magnesium

Aluminum Bronze (1969-71)

92%copper + 2% nickel + 6% Aluminum

Stainless Steel (1988-2002)

Ferritic Stainless Steel ( chromium 17%, iron 83%)

 

 Blog Credits:- Vedant Londhe - TEAM META MONDAY

4.       REFERENCES:

Ø  https://m.rbi.org.in/Scripts/mc_coinage.aspx

Ø  https://www.wikipedia.org

Ø  https://www.quora.com/How-are-coins-made-in-India

Ø  https://m.rbi.org.in//Scripts/restrospectcoins.aspx

Ø  https://www.scribd.com/document/260692108/metal-composition-of-1-rs-coin

Ø  http://www.ripublication.com/iraer.htm

NOTE :-

This blog is meant for Educational Purpose only .We do not own any Copyrights related to images and information , all the rights goes to their respective owners . The soul purpose of this blog is to Educate, Inspire, Empower and to create awareness in the viewers. The usage is non-commercial(Not For Profit) and we do not make any money from it.

 

 

 

 

 

Comments

Post a Comment

Popular posts from this blog

From Gadget Guru to YouTube Sensation : The inspirational story of tech burner.

Image
  From Gadget Guru to YouTube Sensation   : The inspirational story of tech burner.   In the vast diversity of YouTube creators, Tech-Burner , also known as Shlok Srivastava , stands out as a   inspiration for aspiring content creators and tech enthusiasts peoples like me. His journey started   from a college student with a passion for gadgets and ended up   with being one of India’s most beloved tech YouTubers is not just a tale of success but also of perseverance, dedication, and authenticity.   Early LIFE :   He was passion Ignited about many gadgets and technical advancements. His story begins like many others a young individual full of curiosity and passion . His interest with technology and gadgets was apparent even during his college days when he was pursuing his engineering degree. Beside from lectures and assignments, he found that exploring the latest gadgets and sharing his Insights with frie...
Read more

CRISPR-Cas9: The Marvel of Gene Editing Unveiled!

Image
    CRISPR-Cas9: The Marvel of Gene Editing Unveiled!   Introduction: Welcome to the incredible world of CRISPR-Cas9 – a cutting-edge technology that's like having a superhero duo for genetic makeovers! CRISPR, or Clustered Regularly Interspaced Short Palindromic Repeats, and its trusty sidekick, Cas9, are rewriting the rules of genetic engineering. Let's embark on this adventure and uncover the magic behind these scientific marvels.   Understanding the Basics: Picture CRISPR as your gene-editing GPS. It contains short, repetitive sequences that act like genetic bookmarks. Now, imagine Cas9 as your molecular scissors, ready to cut and paste DNA with surgical precision. Together, they're a dynamic duo ready to reshape the blueprint of life.   How it Works: Here's the wizardry in action: Scientists design a guide RNA, like a treasure map, leading Cas9 to the specific gene they want to edit. Cas9 follows the map, finds the target gene, and sni...
Read more

Empowering Voices: A Deep Dive into Feminism and Equality

Image
 Recently, we had the privilege of sitting down with Mrs. Aryamba SN, who has successfully navigated the complexities of professional growth and also made a significant impact in the sphere of Women’s rights and empowerment. In this insightful interview, she shares her path to becoming the President of the Equality and Empowerment branch in WICCI Maharashtra, describing her lifelong passion for justice and fairness. Her achievements are impressive and include winning a city event in Pune, being crowned Mrs. India Elixir, winning a sports category in Bangalore, and excelling in an international task-based pageant in 2022. Her writing journey is also noteworthy, as it includes her work on an anthology titled *Strings Attached* and editing other books. Through her work, she met Radhika Sudhir, the National President of WICCI, who appointed her as the Maharashtra President of the Equality and Empowerment wing due to her grassroots-level activism. "Ever since I was a child, I have had ...
Read more