Attempting to create your own vials reminds me a lot of the old pool service trick of dropping a drop or two of reagent directly into the pool and viewing the colors. In theory it works great but there are so many variables involved that you’re likely missing that it’s not really a good approach. Even the size of the dot will alter the end result.
If you’re wanting just a “close enough” result just to give your in-laws a told ya so just take a sample to a pool store or find a test strip. You're likely gonna get get a higher level of accuracy compared to making your own anyways.
If you’re wanting just a “close enough” result just to give your in-laws a told ya so just take a sample to a pool store or find a test strip. You're likely gonna get get a higher level of accuracy compared to making your own anyways.