COIN CLEANING
Question:
Is it all right to use alcohol to remove grease and oil from coins?
Answer:
I don't know of any specific reason for not using alcohol,but l have never seen it recommended, so l would be hesitant to advise using it,particularly on copper alloy coins.
There may be additives in the alcohol which might react with the copper.
One comment, you mentioned rubbing the coins with cotton buds.This l would definitely advise against as this is what causes hairline scratches on proof and silver uncirculated coins.
The rule is never rub a coin with anything, as it could pick up grit and scratch the coin.
Always pat dry,or allow to air dry.
Happy collecting.
Numismatic is "King of Hobbies and Hobby of Kings".
Is it all right to use alcohol to remove grease and oil from coins?
Answer:
There may be additives in the alcohol which might react with the copper.
One comment, you mentioned rubbing the coins with cotton buds.This l would definitely advise against as this is what causes hairline scratches on proof and silver uncirculated coins.
The rule is never rub a coin with anything, as it could pick up grit and scratch the coin.
Always pat dry,or allow to air dry.
Happy collecting.
Numismatic is "King of Hobbies and Hobby of Kings".
Hi Mr.Dickson,
ReplyDeleteDepankanta masih buntu bagaimana nak hilangkan kesan cap jari(fingerprint)yg banyak didapati pada syiling 1 sen?..Kalau yg gred rendah depankanta cuba juga gunakan minyak zaitun(olive oil)dan kain sutera(dapat dari kedai bundle)tapi tak pasti adakah kaedah ini menjejaskan nilai Numis pada syiling berkenaan...
Terima kasih banyak2 Mr.Niew..
TERIMA KASIH BANYAK2 MR.DICKSON,
ReplyDeletePERKONGSIAN INFO YG TERBAIK,SEMOGA PENERANGAN YG PANJANG LEBAR DAN LENGKAP INI MEMBERI PANDUAN KEPADA PENGUMPUL2 BARU DALAM MENJAGA KUALITI SEBENAR KOLEKSI SYILING MEREKA KHASNYA SYILING COPPER/TEMBAGA....
TERIMA KASIH BANYAK2 MR.DICKSON
Rule of Thumb/Syarat Utama dan Muktamad:
ReplyDelete"JANGAN BUAT APA-APA".
Jawapannya:"Cari lagi satu keping yang lebih bagus"haha!
US Grading:Selagi ia masih ada lustre atau sheen,walaupun dengan cap jari,masih boleh dapat Mint State(MS)/UNC,mungkin MS60.
UK Grading:EF/GEF.
Kalau cuba hilangkan kesan cap jari,Grading dari US dan UK:"Doctored Coin".Tidak boleh di grade!
Kalau pakai minyak-minyak apa jua,dua tiga tahun kemudian,ia akan jadi "hitam manis"!
Kena cari syiling sen yang paling cantik condition dan simpan terus dalam holder yg berqualiti,dan lebih kerap tukar holdernya kalau nampak sesuatu yg kurang senang.
Syiling berplanchet copper/tembaga,paling mencabar untuk simpan dalam grade tinggi selalu.
Sesuatu yg cabar baru interesting!
KISAR BENAR:Saya pernah jumpa dealer-dealer yg pandai "CUCI" copper coin,saya juga pernah terperdaya.Beli dalam keadaan BU,bayar harga BU,tiga bulan kemudian muncurlah kebenarannya!