Four perylene pigments were identified in North American automobile original finishes (1974–2019) and the analysis of Perylene Red Y (C.I. Pigment Red 224) was described previously. Perylene Red Y was not a common automotive paint pigment and is no longer used much. The analysis of a second member of the perylene family, Perylene Maroon (C.I. Pigment Red 179), is discussed in this article, and to determine the commonality of its use, spectra of 143 red or maroon metallic original basecoats were examined. Based on this survey, Perylene Maroon was found to be the most common organic pigment used in these. A large number of different pigment combinations involving this perylene were also identified and representative spectra of some of these are presented to illustrate the wide diversity of infrared absorption patterns that result. The individual pigments composing these combinations can often be identified, and this information can be helpful for both classifying and identifying automotive finishes. For red or maroon metallic basecoats produced after the mid-1980s, red pearlescent pigments based on mica became widely used and their identification was discussed previously. More recently, comparable effect pigments using alumina substrates were introduced and the identification of red alumina-based pearlescent pigments is described in this report. Three very unusual automotive paint formulations were identified and their spectra are presented to aid in vehicle identification.

在北美汽车原始饰面（1974-2019 年）中发现了四种苝颜料，之前描述了对苝红 Y（CI 颜料红 224）的分析。苝红 Y 不是一种常见的汽车油漆颜料，不再使用太多。本文讨论了对苝系列的第二个成员 Perylene Maroon（CI 颜料红 179）的分析，为了确定其使用的共性，我们检查了 143 种红色或栗色金属原始底漆的光谱。根据这项调查，发现苝褐红色是其中最常用的有机颜料。还确定了大量涉及这种苝的不同颜料组合，并提供了其中一些的代表性光谱，以说明由此产生的红外吸收模式的广泛多样性。通常可以识别组成这些组合的单个颜料，这些信息有助于对汽车饰面进行分类和识别。对于 1980 年代中期之后生产的红色或栗色金属底漆，基于云母的红色珠光颜料被广泛使用，它们的识别已在前面讨论过。最近，引入了使用氧化铝基材的类似效果颜料，本报告描述了基于红色氧化铝的珠光颜料的鉴定。确定了三种非常不寻常的汽车涂料配方，并提供了它们的光谱以帮助车辆识别。对于 1980 年代中期之后生产的红色或栗色金属底漆，基于云母的红色珠光颜料被广泛使用，它们的识别已在前面讨论过。最近，引入了使用氧化铝基材的类似效果颜料，本报告描述了基于红色氧化铝的珠光颜料的鉴定。确定了三种非常不寻常的汽车涂料配方，并提供了它们的光谱以帮助车辆识别。对于 1980 年代中期之后生产的红色或栗色金属底漆，基于云母的红色珠光颜料被广泛使用，它们的识别已在前面讨论过。最近，引入了使用氧化铝基材的类似效果颜料，本报告描述了基于红色氧化铝的珠光颜料的鉴定。确定了三种非常不寻常的汽车涂料配方，并提供了它们的光谱以帮助车辆识别。