The Colortune isn't to determine the color of the spark, but for the color of the combustion itself, which is useful for tuning fuel / timing (leaner mixtures will be bluer in color,
where richer mixtures are redder.
The researchers found five different sub-types of HL among the patients studied: 247 cases of the nodular sclerosis (NS) type, in which the tumour nodules are large; 105 of mixed cellularity,
where a
mixture of different types of inflammatory cells are involved; 58 lymphocyte
rich, the sub-type with the best outcome; 68 «others»; and 143 «not otherwise specified» (NOS).