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Curiosity Corner #209: French Chalk.
Recently read in a Stamp Magazine:
"MG also wanted to know how I use French chalk to keep my mint stamps from damp, I just give them a light dusting as though I was adding salt to a hard boiled egg. Too much could possibly effect the surface in some way I don't know about, so I only sprinkle lightly" |
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Curiosity Corner #209: French Chalk.
Rodney wrote: Recently read in a Stamp Magazine: "MG also wanted to know how I use French chalk to keep my mint stamps from damp, I just give them a light dusting as though I was adding salt to a hard boiled egg. Too much could possibly effect the surface in some way I don't know about, so I only sprinkle lightly" Rodney: Are you recommending the use of French chalk? What date was the article? Blair |
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Curiosity Corner #209: French Chalk.
Nay, Blair.
A genuine curiosity for me, I was/am fishing for comments The author who wrote it back in the 80's, wrote under a nom-de-plume, but I always had an inkling it was a philatelist of renown from Perth here. Just as Otto Hornung surprised me his suggestion he stored stamps around moth balls, this came as a surprise. So?...your opinion? |
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Curiosity Corner #209: French Chalk.
Some random trivia on French Chalk:
Talc Talc has the formulae Mg3Si4O10(OH)2 and a relative hardness of 1. It is a mineral of secondary origin formed by the alteration of magnesium silicates. Usually found in metamorphic rocks where, in a non-crystalline form, it occurs as 'soapstone' - and can make up large rock masses. Used for laboratory table tops and for many industrial uses. It has a greasy feel. st helena stamps It is mentioned that the sheets were interleaved with wax paper to stop adhesion between the sheets. This practice seems to have ceased for the Queen Elizabeth definitives and replaced by french chalk to prevent this adhesion. To deal with stamps soiled with grease or oil, you need a household iron and ironing board. Place the stamp between two sheets of brown paper and gently run a warm, not hot, iron over it. Repeat this process several times, changing the position of the stamp to a clean piece of paper each time, until as much grease as possible has been removed. Then, liberally sprinkle the stamp with French chalk and place the stamp between clean paper and leave under pressure for 24 hours. This should get rid of all the grease, but if it has been there for a considerable time, the process may need to be repeated two or three more times http://www.breadonthewaters.com/0022...ollecting.html French Chalk French Chalk is a form of steatite or talc, used by tailors for marking cloth for which its softness and burability on the material make it very suitable. It is also used as a dusting agent to prevent adhesion of a tacky surface, as a filler in plastics and to polish floors. It can be distinguished from ordinary chalk by its greasy feel. Steatite Steatite (soapstone) is a variety of talc, hydrated magnesic silicate, usually devoid of a distinct crystalline structure. |
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