Posted 2 years ago
anniediner…
(2 items)
I own two blue glass quilted canning jars. There is no maker's mark. Both jars are made of clear glass with a blue overlay on the outside, and the number 4 on the clear glass bottom.
Can you identify the brand of these jars? They take a standard Ball jar 2-piece lid.
Do you know whether they are food safe? (since the blue is on the outside)
Since you say the blue is only on the outside of the jar and the bottom and rim are clear glass and there are no markings on the jar, my concern is the blue could be an applied coloring (a glass “stain”).
If the blue is indeed just an applied coloring, it would probably come off during the canning process involving boiling water inside a pressure cooker.
An applied coloring will also come off if scratched or if tape is applied then pulled off….and in picture #2, there appears to be a scratch and some suspicious irregularities that could indicate the blue is a film of coloring.
All that said, it’s an attractive jar with it’s pretty color and great texture but it might not be a canning jar.
Just my opinion after a considerable amount of actual canning experience.
I hope others here will chime in.
I understand your concern. However, quilted canning jars are quite common in several colors and brands. It's not unusual for old glass to have scratches. A standard canning jar top fits perfectly.
I would hesitate to use these for lengthy water bath or pressure canning because 1. the process could damage or completely ruin the blue coating and 2. they could break in the canning process. That being said, I would consider using them for jams & jellies since they can either not be processed at all or for a very short period. I've known people who can in mayonnaise jars and the like without a problem. However, I always feel like I work too hard to waste my harvest because a jar broke in the canner. They would be very pretty for gifting.
I agree with jarsnstuff. I think it’s a clear glass jar that has an applied blue coloring to the outside body of the jar, made to give the impression of blue glass.
If it were truly blue glass, the mouth of the jar would also be blue. However, with an applied blue coloring, that blue film would be worn off by the jar lid so the manufacturer left the coloring off the rim.
I have a blue glass canning jar with no writing on it. I can't find any info on unmarked blues. It's got a full seam, has "soft spots" in a couple areas along with some bubbles. Any help would be appreciated. I love the quilted jar original poster posted. Thanks for sharing that. Stan