The character printing above or below its proper position in the type block.

It is any peculiarity of typewriting caused by actual damage to the typeface metal which maybe actual breakage in the line of the letters.

Typeface defect in which a character prints a double impression with the lighter one slightly off-set to the right or left.

Typeface impression ordinarily spaced ten (10) characters to the horizontal pitch.

Is an act of side-by-side examination of two or more specimens under consideration so us to weight their identifying details.

The typeface became filled with dirt and ink. Particularly in enclose letters such a small letter o, e. p, and g.

Typeface defect in which a character prints a double impression with the lighter one slightly off-set to the right or left.

It is used to include letters symbols, numerals or point of functions.

This type of ink was coming from sulphate of iron with gum-the most durable ink solution for records purposes.

This type of inks are supposed to be best writing inks, quick drying, waterproof and durable. So, manufactures introduced alkali-resistant dyes in caustic soda solutions.

This type of inks are supposed to be best writing inks, quick drying, waterproof and durable. So, manufactures introduced alkali-resistant dyes in caustic soda solutions.

The condition of a typeface printing heavier on one side or corner the remainder of its outline.

This ink originating from Germany 1760 and from England 1835. Indigo added to an iron tannin solution. Blue at time of writing, but that fades, the iron oxidizes, and the writing turns black.

This pen requires special ink of high tinctorial value. It is made of fast dyes soluble in glycol type solvents; the vehicles (carbitols, glycols or oleic acid) must have low vapor pressure in order to eliminate evaporation of the ball from clogging.

These are used mostly when a penetrating marking is desired that will not be erased. It is not commonly used except for special reasons. It is composed of logwood, potassium, aniline, bi-chromate, nutgall, gum and silver nitrate.

The kind of black ink that appears blue initially but becomes black when exposed to moisture is the logwood ink with potassium chromate.

This is the type of ink not readily visible, it need a process so that the  writing appear.

These inks are composed of aqueous solutions of synthetic dyestuffs, to which a preservative and a flux are added.

This ink originated from United States and England 1860. Colored with aniline dyes, but these inks fade when exposed to sunlight.