Photomicrographs of Artifacts

Photograph 8-1 Grinding pits remaining on hastily polished surface of clinker appear somewhat like dark alkali sulfate. (S A6717) 

Photograph 8-2 Exudation of polishing vehicle (propylene glycol) or cleaning medium (isopropyl alcohol) from an alite cleavage on polished section surface. The exudation could be misinterpreted as chemical attack of the alite crystal. (S A6718) 

Photograph 8-3 Etch halo around free lime nest observed after NH CI etch ( H in text, Chapter 3). The halo may be the result of etch interference by liquid exuding from the porous free lime crystals and nearby pores. (S A6719) 

Photograph 8-4 Residual liquid and halo (arrow) from polishing, cleaning, or etching, extending across alite into blue belite nest. (S A6720) 

Photograph 8-5 Residual liquid from polishing or cleaning sample and halo of unetched belite surrounding central pore. Liquid could be misinterpreted as free lime. Liquid eventually dried. (S A6721) 

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