Gas emission tubes are widely used laboratory and demonstration apparatus because the line source nature of the tube produces line spectra when viewed directly through a diffraction grating. These are long and distinctly visible images of the tube, located to either side of the zeroth order at an angle determined by the wavelength. A continuous spectrum with each distinct color being a vertical line is produced by an incandescent bulb having a vertical line filament. P. J. Ouseph first contrasted spectra from thin white and black lines in an interesting activity reported in this journal in 1989. The author reports here a simple and useful method for presenting the spectral distribution of diverse sources and filters, or the reflected light from colored samples (inks, color swatches, etc.), that has the same visual impact and didactic benefits of the line sources noted above. This technique was devised as part of inquiry curriculum for the Light and Color class at Bellevue College. This note extends the use of standard line sources for producing visible spectra to a diverse variety of sources through the use of thin white linear screens (TWLS) to produce line spectra by reflection.