Wisting, Amundsen wrote in his diary, "is sitting in the Great Ice Barrier and sewing tents on his Singer -- in +14°. To stop water dripping, he has lined his snowy sewing room with blankets ... and these insulate extraordinarily well. The sewing machine is a little sleepy first thing in the morning, but later on works well.... He is sewing new, light groundsheets in [the tents]. By this means, we will save several kilos." 
"Our sledging tents are of thin, white cloth, and that will be no good in the spring, when the sun is high. It will then be preferable to have a dark tent, into which one can go after the day's work, and rest one's eyes. Another consideration is that a dark colour will absorb the sun's rays to a greater degree, and make the tent warm. Ah well, we rarely allow ourselves to be defeated. We have made a mixture of ink powder and black boot polish, and with that product, we will get our tents as dark as we want."
 Roald Amundsen Bildearkiv, Nasjonalbiblioteket.
 Roald Amundsen, diary, 5 July, 1911, quoted by Roland Huntford in The Amundsen Photographs (London : Hodder & Stoughton, c1987), p.111.