Uneven growth

This line of uneven alloy growth is uauly associated with steels with silicon in the sandelin range.  The recessed area is normal alloy thickness growth that appears to be a low point due to the very thick coating around it.  Coatings like this can be upwards of 700microns and are usually dull grey, uneven and brittle.  Steels outside the Sandelin range for siliocn will not develop this coating.  If they cannot be avoided then very good venting will limit the time of the article in the bath and so limit the coating thickness.  This is acceptable.

line, rough, uneven, inconsistent, gap

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