[Jewelry making - Article 00181] - [Orchid] Enamel(ing) Advice: Blythe's acid resistantance?

[CalEnamelist]

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    Perhaps some of the readers familiar with enameling could share
    their wisdom on Johnson Matthey's Blythe Enamels. 

    Just how acid and chemical resistant are the older transparent
    Blythe enamels? 

    In particular, # 225 Green (date on package is 9 December 1975) & #
    788 Blue (not dated on package ...may be mid 1970's too). My
    original 1/2 kilo packages for #'s 225, 788 & 2092 indicate
    transparent colors. 

    In Jeanne Werge-Hartley's book she provided a very useful table of
    technical information on firing temperatures (attributed to Vitrum
    Signum on pg. 162). However, I have an information void when it
    comes to chemical and acid resistance of these transparents; and I
    am contemplating electroforming some Blythe enameled pieces. 

    As I recall; the following are probably 25 year old Blythe product.
    Possibly someone knows of an old Blythe product profile similar to
    that found in "Enameling on Precious Metals" with technical data on
    temps and flow point for the following (not found in Jeanne's book): 

	OPAQUES 
	557     Purple
	682     Green
	684     Blue
	1924    Blue
	2174    Blue
	3016    Brunswick Green K31
	3040    Mauve A25
    
	Transparent 
	225     Green       (date on package is 9 December 1975)
	242     Chedron
	788     Blue        (not dated on package may be mid 1970's)
	935     Red
	1072    Yellow
	2092    Gray Green  (date on package is 5 Aug 1978)
    
	Opalescent  
	1533    White

Regards,
Mark


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