geng-chen day pillar

辰 is earth, the element that feeds metal, and 庚 sits on it as yang metal. The count stands at Nurture, one step before 庚 starts its new round at 巳. 三命通會 卷五 gives that next point in the phrase 庚生巳死子, so the pair sits at the threshold of a beginning.

From 庚 the three usual stems of 辰 read as Indirect Resource for 戊, Direct Wealth for 乙 and Hurting Officer for 癸. Replace 癸 with the 壬 that 三命通會 prefers and the last becomes Eating God. The difference is one of polarity alone.

白蠟金 is White Wax Metal. 三命通會 卷一 is brief: 庚辰金，锡蜡, tin and wax, a soft metal beside a softer stuff. Its next clause, 喜秋及微木, says autumn pleases it and so does wood in a small amount, and the little word 微 is what sets the limit.