Hello; I have some gravel from at least the 1960's. Several hundred pounds from the 1970's. It does not go bad or wear out. I have several buckets with gravel that has been used many times and is going to be used again if my plans work out. If you do not like the color, the gravel can be used in temporary setups, for growing plants or in non-show tanks. Another thing is that it does not get any cheaper over time. I would like to find some more of the black quartz gravel that I purchased in the 70's.