Just draw a line on the surface of a heated object and the temperature is indicated by the melting of the crayon line.
The temperature indicating materials of irreversible type may change the color during the transportation, depending upon season, destination and handling.


Example

Number	Color	Indicated Temp (oC)	Accuracy
M-40	Red	40	+/- 5oC
M-50	White	50
M-60	Blue	60
M-70	Green	70
M-80	Red	80
M-90	Yellow	90
M-100	Green	100
M-110	Reddish Orange	110
M-130	Greenish Yellow	130
M-140	Blue	140
M-150	Pale Red	150
M-160	White	160
M-170	Pale Yellowish White	170
M-180	Pale Green	180
M-190	Blue	190
M-200	Pale Red	200	+/- 10oC
M-215	Bluish Green	215
M-230	Black	230
M-240	Yellow	240
M-255	Green	255
M-265	Dark Blue	265
M-280	Red	280
M-290	Pale Orange	290
M-300	Purple	300
M-320	Brown	320
M-330	Yellowish Green	330
M-350	Reddish Orange	350
M-430	Green	430	+/- 15oC
M-460	Red	460
M-490	White	490
M-520	Pale Yellowish Green	520
M-545	Pale Brown	545
M-570	Bright Gray	570
M-590	Bluish Purple	590
M-615	Dark Green	615
M-645	Reddish Purple	645
M-670	Greenish Blue	670
M-700	Orange	700
M-730	Bluish Green	730
M-765	Yellow	765
M-795	Red	795
M-825	Purple	825
M-855	Green	855
M-885	Blue	885
M-915	Reddish Yellow	915
M-945	Gray	945
M-985	Yellow	985
M-1010	Gray	1010

* Applications :
- To monitor the temperature of forging, hardening, annealing, tempering, heat processes, etc.
- To monitor the temperature of silver soldering, soft soldering and other welding processes.
- To monitor the temperature of the outer walls of reactors, electric furnaces, smelting furnaces, etc.
- To monitor heat generation of plant pipes, etc.
- To monitor the temperature of dies and during molding of synthetic resins, rubber, glass, etc.