What is absolute and relative age dating
These are faint, somewhat wandering, hairline seams which if present (usually) are sporadically visible on the sides of machine-made bottles.The ghost seams are caused by the parison mold parts and if visible enough will be "attached" to the vertical seams in the finish.Furthermore, a recent study seems to back up this conclusion.I shaped the curves for internal and external attractiveness separately, without giving consideration to each's effect on the combined curve.(Mold seam thickness and how high it protrudes [height] is of only moderate use in telling a machine-made bottle from a mouth-blown bottle, though if a bottle fragment has a hair fine mold seam, it is highly likely to be from a machine-made bottle.) 3.There are at least two additional finish related mold seams - one at the top of the finish which encircles either the bore or sometimes the outside of the upper lip portion of the finish (sometimes of these seams are present) and a horizontal seam immediately below the finish which circles the extreme upper neck (called a "neck ring parting line").Some women never make this internal development, as illustrated in one of the example variations, posted here.Notice that the full potential for combined attractiveness is never reached, because the peak of internal and external attractiveness do not occur simultaneously.
Notice, too, how the decline in external attractiveness is ameliorated by the increase in internal attractiveness, flattening out the decline. These deviations are discussed on the main Bottle Dating page in a box under 4.