<html><head></head><body lang="en-US" style="background-color: rgb(255, 255, 255); line-height: initial;"> <div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Dear Photo Collectors</span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Attached is the ultimate example of a chimney clogged by long chain hydrocarbons‎.</span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">No further comment needed.</span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Crispin </span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br></span></div><div style="width: 100%; font-size: initial; font-family: Calibri, 'Slate Pro', sans-serif, sans-serif; color: rgb(31, 73, 125); text-align: initial; background-color: rgb(255, 255, 255);"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Dear Kirk, Paul and all,</span><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Kirk: thanks for circulating your hypothesis. This seems well-founded.</span><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Paul: measuring long-chain hydrocarbons / tars is part of the planned project of PhD student Thomas Kirch.</span><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">The intention is to measure the tars fairly soon. The catch is that our existing micro-GC isn't suitable for this, and finding someone who is willing to put our tars in their GC-MS is proving difficult. Until we get funds to buy our own, any suggestions for other ways of characterising the tars?</span><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Cheers,</span><br style="color: rgb(0, 0, 0); font-family: 'Slate Pro';"><span style="color: rgb(0, 0, 0); font-family: 'Slate Pro';">Paul</span></div></body></html>