Photo from Feb 19, 2017 sampling of Bogoslof ash deposited on Jan 31, 2017 on west side of Unalaska Island. Wind and exposure to sunlight since the ashfall event has caused the deposit to have this curd-like texture in firn snow. Only trace amounts of ash were found at all sites (trace = less than 1/32 of an inch or less than 0.8 mm).
Image courtesy of AVO/USGS.