Provided are an efficient method for producing 3,4-dihydroisoquinoline derivatives and useful production intermediates thereof. Examples of cations of the ionic liquid, may include, for example, cations having a quaternized nitrogen atom. The computer device makes a white point adjustment to the display device, based on a color temperature color preset selected from among the plurality of color temperature color presets by a selecting operation from the computer device. The emissions treatment substance may be moved out of the co-located portion of the fill tube to an area where passive or active heating of the fill tube may be applied.