The purpose of this study is to examine the influence of light on the changes in typographic and colorimetric properties of ink jet prints in order to establish an appropriate typeface style and type size for business correspondence to ensure information permanence. The prints were made with six ink jet printers from different manufacturers on four different office papers. Four different, widely used typefaces (one old-style, one transitional, and two sans-serif) in five different sizes (6, 8, 10, 12, and 16 pt) were tested. The resistance of printed business correspondence to light was evaluated according to the ISO 12040 standard. The color differences were determined spectrophotometrically. The differences in typographic tonal density and wicking of typefaces were measured with image analysis. After the exposure to light, the biggest difference in typographic tonal density was observed at type sizes 6 and 8 pt, and at one of the sans-serif typefaces.