Despite being newly married to a man called Grady, Shug instigates a sexual relationship with Celie on her next visit. One night Shug asks Celie about her sister, and Shug helps Celie recover letters from Nettie that Mister has been hiding from her for decades. The letters indicate that Nettie befriended a missionary couple, Samuel and Corrine, the well-dressed woman that Celie saw in the store, whom Nettie eventually accompanied to Africa to do missionary work. Samuel and Corrine have unwittingly adopted both Adam and Olivia. Corrine, noticing that her adopted children resemble Nettie, wonders if Samuel fathered the children with her. Increasingly suspicious, Corrine tries to limit Nettie’s role in her family.
Blonde (or blond for men ) hair ranges from nearly white (platinum blonde, tow-haired) to a dark golden blonde. Strawberry blonde, a mixture of blonde and red hair, is a much rarer type containing the most pheomelanin. 
Blonde hair can have almost any proportion of pheomelanin and eumelanin, but has only small amounts of both. More pheomelanin creates a more golden or strawberry blonde color, and more eumelanin creates an ash or sandy blonde color. Many children born with blonde hair develop darker hair as they age, with the majority of natural blondes developing a hair color of a dark blonde hue by the time they reach middle age. Pregnancy hormones hasten this process. Natural light blonde hair is rare in adulthood, with claims of the world’s population ranging from 2% naturally blonde [self-published source] to 16% in the US. Blonde hair is most commonly found in Northern and Western Europeans and their descendants but can be found spread around most of Europe. Studies in 2012 showed that naturally blonde hair of Melanesians is caused by a recessive mutation in tyrosinase-related protein 1 (TYRP1). In the Solomon Islands, 26% of the population carry the gene; however, it is absent outside of Oceania.