Photograph 4. Newly laid, flamed G684 that has been enhanced to darken it then cleaned with acid to remove it. Note the colour contrasts depending on the strength of the acid and dwell time.
g684-4
Photograph 4. Newly laid, flamed G684 that has been enhanced to darken it then cleaned with acid to remove it. Note the colour contrasts depending on the strength of the acid and dwell time.