The HMS Datasheets were used to produce the CFA Guidelines for  
Archaeometallurgy (available as a free PDF download from English  
Heritage). It contains lots of color photos of slag, etc.

http://www.english-heritage.org.uk/upload/pdf/cfa_archaeometallurgy2.pdf

James Brothers, RPA
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On Apr 27, 2006, at 13:45, timothy mancl wrote:

> Chris,
>
> I wrote a thesis on the types, and chemical analysis of bloomery  
> slag from a site in Negaunee, Michigan. It includes images of the  
> different forms of slag found, and of one type of hammer scale  
> (spheroidal) and the problem associated with recovery. In a  
> discussion I had after writing the thesis, a current smelter of  
> bloomery iron mentioned that much of the slag produced from  
> refining would visually resemble that resulting from bloomery  
> smelting.
>
> The chapter on slag might be small enough to email (about 1 MB).  
> Please contact me off-list if you're interested. In addition, you  
> might find the datasheets (available online) from the Historical  
> Metallurgy Society helpful.
>
> Tim Mancl, RPA
> Heite Consulting